diff --git a/debian/control b/debian/control
index 94a0fe73..a5e5a93b 100644
--- a/debian/control
+++ b/debian/control
@@ -9,7 +9,7 @@ Vcs-Git: git://www.verdnatura.es/var/git/hedera-web
 
 Package: hedera-web
 Architecture: all
-Depends: apache2, php5-mysql, php-vn-web
+Depends: apache2, php5-mysql, php5-mcrypt, php-vn-web
 Suggests: php-text-captcha, php5-imap, vn-image, tinymce
 Section: misc
 Priority: optional
diff --git a/lib/vn/hedera/web.php b/lib/vn/hedera/web.php
index b66c02a7..b9b0f701 100755
--- a/lib/vn/hedera/web.php
+++ b/lib/vn/hedera/web.php
@@ -131,9 +131,9 @@ class Web
 			}
 		}
 
-		try {
-			Auth::getCredentials ();
+		Auth::getCredentials ();
 
+		try {
 			self::$conn = new Conn ();
 			self::$conn->open (
 				 $conf['db']['host']
@@ -145,17 +145,17 @@ class Web
 			self::$conn->query ('CALL user_session_start (#)', [session_id ()]);
 			self::$conn->query ('SET @lang = #', [\Vn\Lib\Locale::get ()]);
 
-			Auth::login ($useCookies);
+			Auth::login (TRUE, $useCookies);
 		}
 		catch (\Exception $e)
 		{
 			self::$conn = NULL;
-			$success = FALSE;
+			Auth::login (FALSE);
 		}
 
 		// Registering the user access
 
-		if ($success && !$wasLoged)
+		if (!$wasLoged)
 			unset ($_SESSION['visitUser']);
 
 		if (isset ($_SESSION['access'])
@@ -171,12 +171,10 @@ class Web
 					,session_id ()
 				]
 			);
-		
+	
 			if (!isset ($_SESSION['visitUnknown']) && !$success)
 				$_SESSION['visitUnknown'] = $_SESSION['visitUser'];
 		}
-
-		return $success;
 	}
 
 	static function deinit ()
diff --git a/lib/vn/tpv/tpv.php b/lib/vn/tpv/tpv.php
index f1a5f0d9..5369c51e 100755
--- a/lib/vn/tpv/tpv.php
+++ b/lib/vn/tpv/tpv.php
@@ -213,6 +213,45 @@ class Tpv
 		
 		return FALSE;
 	}
+	
+	static function transactionStart ($conn, $amount, $urlOk, $urlKo, $companyId, &$url, &$signature)
+	{
+		$row = $conn->getRow ('CALL transaction_start_sha256 (#, #)',
+			[$amount, $companyId]);
+		
+		if (!isset($row))
+			throw new Exception ('Transaction error');
+			
+		$transactionId = str_pad ($row['transaction_id'], 12, '0', STR_PAD_LEFT);
+		$urlOk = empty ($urlOk) ? '' : sprintf ($urlOk, $transactionId);
+		$urlKo = empty ($urlKo) ? '' : sprintf ($urlKo, $transactionId);
+		$merchantUrl = $row['merchant_url'] ? $row['merchant_url'] : '';
+		
+		$params = [
+			 'Ds_Merchant_Amount'            => $amount
+			,'Ds_Merchant_Order'             => $transactionId
+			,'Ds_Merchant_MerchantCode'      => $row['merchant']
+			,'Ds_Merchant_Currency'          => $row['currency']
+			,'Ds_Merchant_TransactionType'   => $row['transaction_type']
+			,'Ds_Merchant_Terminal'          => $row['terminal']
+			,'Ds_Merchant_MerchantURL'       => $merchantUrl
+			,'Ds_Merchant_UrlOK'             => $urlOk
+			,'Ds_Merchant_UrlKO'             => $urlKo
+		];
+		
+		$encodedParams = base64_encode (json_encode ($params));
+		
+		$key = base64_decode ($row['secret_key']);
+		
+		$bytes = array (0, 0, 0, 0, 0, 0, 0, 0);
+		$iv = implode (array_map ("chr", $bytes));
+		$key = mcrypt_encrypt (MCRYPT_3DES, $key, $transactionId, MCRYPT_MODE_CBC, $iv);
+		
+		$signature = base64_encode (hash_hmac ('sha256', $encodedParams, $key, TRUE));
+		$url = $row['url'];
+		
+		return $encodedParams;
+	}
 
 	/**
 	 * Tests the confirmation process. The corresponding record
diff --git a/web/forms/ecomerce/catalog/style.css b/web/forms/ecomerce/catalog/style.css
index 3b05f6c1..2543c6f1 100755
--- a/web/forms/ecomerce/catalog/style.css
+++ b/web/forms/ecomerce/catalog/style.css
@@ -32,7 +32,7 @@
 	right: 0;
 	width: 17em;
 	background-color: white;
-	box-shadow: 0 0.2em 0.2em rgba(1, 1, 1, 0.4);
+	box-shadow: 0 0 .2em rgba(1, 1, 1, 0.4);
 	overflow: auto;
 }
 .right-panel > .body
@@ -53,7 +53,7 @@
 {
 	background-color: #00acc1;
 	color: white;
-	box-shadow: 0 0.1em 0.1em rgba(1, 1, 1, 0.3);
+	box-shadow: 0 .1em .1em rgba(1, 1, 1, 0.3);
 }
 .right-panel .basket-info > button
 {
@@ -94,10 +94,10 @@
 	margin: 0;
 	margin-top: .4em;
 	line-height: 2em;
+	max-width: 85%;
 	text-overflow: ellipsis;
 	white-space: nowrap;
 	overflow: hidden;
-	max-width: 85%;
 }
 .vn-filter li > button
 {
@@ -205,16 +205,16 @@ td.third-category
 	display: inline-block;
 	text-align: left;
 	position: relative;
-	width: 22em;
-	padding: .8em;
+	width: 23em;
+/*	padding: .8em;*/
 	margin: .4em;
 	margin-bottom: .1em;
-	height: 9em;
+	height: 10em;
 	overflow: hidden;
 }
 .item-box > .image
 {
-	width: 9em;
+	width: 10em;
 	height: 100%;
 	float: left;
 	margin-right: 1em;
@@ -225,35 +225,46 @@ td.third-category
 	height: 100%;
 	display: block;
 	margin: 0 auto;
-	border-radius: .3em;
+/*	border-radius: .3em;*/
 }
 .item-box > p
 {
 	margin: 0;
 	padding: 0;
-	font-size: .9em;
+	color: #777;
+	font-size: .8em;
+	text-overflow: ellipsis;
+	white-space: nowrap;
+	overflow: hidden;
 }
 .item-box > .producer
 {
 	text-transform: uppercase;
-	font-size: 1em;
 }
 .item-box > h2
 {
-	font-size: 1.1em;
+	font-size: 1.2em;
 	font-weight: normal;
+	padding-top: .6em;
 }
 .item-box > .aval-price
 {
 	position: absolute;
-	bottom: 1em;
-	right: 4em;
+	bottom: .6em;
+	right: 3.5em;
+}
+.item-box .from
+{
+	font-size: .8em;
+	font-style: italic;
+	
 }
 .item-box > .add-button
 {
 	position: absolute;
-	bottom: .5em;
-	right: .5em;
+	bottom: .2em;
+	right: .3em;
+	padding: .3em;
 }
 .item-box > .info-button
 {
@@ -282,8 +293,8 @@ td.third-category
 		top: 0;
 		right: -17em;
 		z-index: 20;
-		transition: 200ms ease-out all;
-		-webkit-transition: 200ms ease-out all;
+		transition: transform 200ms ease-out;
+		-webkit-transition: transform 200ms ease-out;
 	}
 	.right-panel.show
 	{
diff --git a/web/forms/ecomerce/catalog/ui.xml b/web/forms/ecomerce/catalog/ui.xml
index e068abc6..cdee7115 100755
--- a/web/forms/ecomerce/catalog/ui.xml
+++ b/web/forms/ecomerce/catalog/ui.xml
@@ -61,7 +61,7 @@
 			CALL bionic_calc ();
 			SELECT a.Id_Article item_id, a.description, b.available, b.price,
 			p.name producer, a.Foto, a.Article, a.Categoria, a.Medida,
-			a.Tallos, c.str color, o.str origin
+			IF(a.Tallos > 1, a.Tallos, NULL) Tallos, c.str color, o.str origin
 				FROM tmp.bionic_item b
 					JOIN vn2008.Articles a ON a.Id_Article = b.item_id
 		    		LEFT JOIN vn2008.producer p ON p.producer_id = a.producer_id
@@ -200,6 +200,17 @@
 		<p class="producer">
 			<htk-text form="item" column="producer"/>
 		</p>
+		<p>
+			<t>Size</t> <htk-text form="item" column="Medida"/>, 
+			<t>Category</t> <htk-text form="item" column="Categoria"/>
+		</p>
+		<p>
+			<t>Color</t> <htk-text form="item" column="color"/>
+			<htk-text form="item" column="Tallos" format=", %.0d Units"/>
+		</p>
+<!--	<p>
+			<t>Origin</t> <htk-text form="item" column="origin"/>
+		</p>
 		<p>
 			<htk-text form="item" column="Medida"/> 
 			<htk-text form="item" column="Categoria"/> 
@@ -209,9 +220,11 @@
 			<htk-text form="item" column="origin"/> 
 			<htk-text form="item" column="Tallos" format="%.0d Units"/>
 		</p>
-		<div class="aval-price">
+-->		<div class="aval-price">
 			<htk-text form="item" column="available"/> 
-			<t>from</t> 
+			<span class="from">
+				<t>from</t>
+			</span> 
 			<span class="price">
 				<htk-text form="item" column="price" format="%.2d€"/>
 			</span>
diff --git a/web/forms/ecomerce/orders/orders.js b/web/forms/ecomerce/orders/orders.js
index 9218e5d6..e666ada2 100755
--- a/web/forms/ecomerce/orders/orders.js
+++ b/web/forms/ecomerce/orders/orders.js
@@ -33,7 +33,6 @@ Vn.Orders = new Class
 	
 	,onPayButtonClick: function ()
 	{
-		var company = 442;
 		var amount = -this.$('debt').value;
 
 		amount = amount <= 0 ? null : amount;
@@ -45,7 +44,7 @@ Vn.Orders = new Class
 
 		var amount = parseFloat (prompt (_('AmountToPay:'), defaultAmountStr));
 	
-		Vn.Tpv.pay (this.conn, amount, company);
+		Vn.Tpv.pay (this.conn, amount, null);
 	}
 });
 
diff --git a/web/js/db/conn.js b/web/js/db/conn.js
index 0f4e1615..ea16e018 100755
--- a/web/js/db/conn.js
+++ b/web/js/db/conn.js
@@ -75,15 +75,25 @@ Db.Conn.implement
 	 */
 	,opened: function (request, openCallback, success)
 	{
+		var error = null;
 		var openSuccess = false;
 
 		if (success)
 		try {
 			var json = request.getJson ();
 			openSuccess = json.data == true;
+			
+			if (json.error)
+				error = new Vn.Error (
+					json.error.domain,
+					json.error.code,
+					json.error.message);
 		}
-		catch (e) {}
-	
+		catch (e)
+		{
+			error = e;
+		}
+
 		if (openSuccess)
 		{
 			this.connected = true;
@@ -93,7 +103,7 @@ Db.Conn.implement
 		this.signalEmit ('loading-changed', false);
 		
 		if (openCallback)
-			openCallback (this, openSuccess);
+			openCallback (this, openSuccess, error);
 	}
 
 	/**
diff --git a/web/js/hedera/app.js b/web/js/hedera/app.js
index ca483d23..e6d8d806 100644
--- a/web/js/hedera/app.js
+++ b/web/js/hedera/app.js
@@ -3,8 +3,6 @@ Vn.App = new Class
 ({
 	Extends: Vn.Object
 
-	,_guestLogged: false
-
 	,initialize: function ()
 	{
 		window.onerror = this._onWindowError.bind (this);
@@ -25,6 +23,9 @@ Vn.App = new Class
 	,run: function ()
 	{
 		var guest = Vn.Cookie.check ('hedera_guest');
+		
+		if (guest)
+			Vn.Cookie.unset ('hedera_guest');
 	
 		if (Vn.Cookie.check ('vn_pass'))
 		{
@@ -41,9 +42,6 @@ Vn.App = new Class
 			login.on ('login', this._onLogin, this);
 			login.show ();
 		}
-		
-		if (guest)
-			Vn.Cookie.unset ('hedera_guest');
 	}
 	
 	,_onGuestChange: function ()
@@ -65,17 +63,15 @@ Vn.App = new Class
 	
 	,_onGuestLogin: function (conn, success)
 	{
-		if (!success)
+		this._isGuest.value = undefined;
+
+		if (success)
 		{
-			this._isGuest.value = false;
-			this.run ();
-		}
-		else
-		{
-			this._guestLogged = true;
 			Vn.Cookie.set ('hedera_guest', true);
 			this._onLogin ();
 		}
+		else
+			this.run ();
 	}
 	
 	,_onAutoLogin: function (success)
@@ -101,10 +97,8 @@ Vn.App = new Class
 	,_onLogout: function (gui)
 	{
 		this._freeGui ();
-		this._guestLogged = false;
 		Vn.Cookie.unset ('hedera_guest');
 		Vn.Cookie.unset ('vn_pass');
-		Vn.Hash.set (null);
 		this.run ();
 	}
 	
diff --git a/web/js/hedera/gui.css b/web/js/hedera/gui.css
index 27c910d9..fdbf5e9d 100755
--- a/web/js/hedera/gui.css
+++ b/web/js/hedera/gui.css
@@ -16,11 +16,6 @@
 
 /* Navigation bar */
 
-.vn-gui .navbar,
-.vn-gui .exit
-{
-	height: 3.9em;
-}
 .vn-gui .navbar
 {
 	position: fixed;
@@ -31,10 +26,15 @@
 	z-index: 1;
 	overflow: hidden;
 	box-shadow: 0 0.1em 0.1em rgba(1, 1, 1, 0.3);
-}
-.vn-gui .navbar
-{
+	height: 3.9em;
 	color: white;
+/*
+	transition-property: left, background-color, transform;
+	transition-duration: 200ms;
+	transition-timing-function: linear;
+*/
+	transition: transform 200ms ease-in-out;
+	-webkit-transition: transform 200ms ease-in-out;
 }
 .vn-gui .menu-button
 {
@@ -156,6 +156,16 @@
 	background-color: white;
 	z-index: 20;
 	box-shadow: 0 0.2em 0.2em rgba(1, 1, 1, 0.4);
+	width: 15em;
+}
+.vn-gui .menu-overflow
+{
+	position: absolute;
+	top: 0;
+	left: 0;
+	right: 0;
+	bottom: 4em;
+	overflow: auto;
 }
 .vn-gui .menu-header
 {
@@ -194,21 +204,6 @@
 	float: right;
 	padding: .2em;
 }
-.vn-gui .left-panel,
-.vn-gui .main-menu > li,
-.vn-gui ul.submenu
-{
-	width: 15em;
-}
-.vn-gui .menu-overflow
-{
-	position: absolute;
-	top: 0;
-	left: 0;
-	right: 0;
-	bottom: 4em;
-	overflow: auto;
-}
 
 /* Test link */
 
@@ -243,6 +238,8 @@
 	float: left;
 	clear: both;
 	padding: 0;
+	margin: 0;
+	width: 100%;
 }
 .vn-gui .main-menu > li > a
 {
@@ -273,6 +270,7 @@
 	z-index: 50;
 	list-style-type: none;
 	padding-left: 0;
+	width: 15em;
 }
 .vn-gui ul.submenu a
 {
@@ -310,32 +308,27 @@
 	height: inherit;
 	box-sizing: border-box;
 	height: inherit;
+
+	transition-property: margin-left, margin-right;
+	transition-duration: 200ms;
 }
 .vn-gui .form-holder
 {
 	position: relative;
 	height: inherit;
 	opacity: 0;
+
 	transform: translateZ(0) translateX(-2em);
+	-webkit-transform: translateZ(0) translateX(0em);
 }
 .vn-gui .form-holder.show
 {
-	transition: 250ms ease-out all;
+	transition: all 250ms ease-out;
+	-webkittransition: all 250ms ease-out;
+
 	opacity: 1;
 	transform: translateZ(0) translateX(0em);
-}
-
-/* Transitions */
-
-.vn-gui > .body
-{
-	transition-property: margin-left, margin-right;
-	transition-duration: 200ms;
-}
-.vn-gui >.navbar
-{
-	transition-property: left, background-color;
-	transition-duration: 200ms;
+	-webkit-transform: translateZ(0) translateX(0em);
 }
 
 /* Desktop */
@@ -372,14 +365,15 @@
 	.vn-gui .menu-button
 	{
 		display: block;
-	}	
+	}
 	.vn-gui .left-panel
 	{
 		top: 0;
 		left: -15em;
 		box-shadow: 0 0.2em 0.2em #333;
-		transition: 200ms ease-out all;
-		-webkit-transition: 200ms ease-out all;
+
+		transition: transform 200ms ease-out;
+		-webkit-transition: transform 200ms ease-out;
 	}
 	.vn-gui .left-panel.show
 	{
@@ -398,6 +392,7 @@
 		border-radius: 0;
 		background-color: white;
 		box-shadow: none;
+		width: auto;
 	}
 	.htk-toast
 	{
diff --git a/web/js/hedera/gui.js b/web/js/hedera/gui.js
index 9ab55c77..61d7f65f 100755
--- a/web/js/hedera/gui.js
+++ b/web/js/hedera/gui.js
@@ -38,18 +38,16 @@ Vn.Gui = new Class
 	,menuShown: false
 	,menuOptions: {}
 	,choosedOption: null
+	,_shown: false
+	,_scrollTimeout: null
+	,_navbarVisible: true
 
 	,initialize: function (props)
 	{
-		Vn.includeCss ('js/hedera/gui.css');
 		this.builderInit ('js/hedera/gui.xml');
 	
 		this.loadingCount = 0;
 
-		this.hash = Vn.Hash;
-		this.hashParam = new Vn.HashParam ({key: 'form'});
-		this.hashParam.on ('changed', this._onFormChange, this);
-
 		this.$('background').onclick = function () {};
 
 		this.$('menu-button').addEventListener ('click', function (event)
@@ -62,26 +60,52 @@ Vn.Gui = new Class
 		{
 			event.stopPropagation ();
 		});
-		
-		if (!Vn.Cookie.check ('hedera_cookies'))
-		{
-			Vn.Cookie.set ('hedera_cookies', true);
-			Htk.Toast.showWarning (_('By using this site you accept cookies'));
-		}
 
 		this.parent (props);
 	}
 	
 	,show: function ()
 	{
+		if (this._shown)
+			return;
+	
+		this._shown = true;
+	
+		Vn.includeCss ('js/hedera/gui.css');
 		document.body.appendChild (this.node);
+		
+		if (Vn.isMobile ())
+		{
+			this._onScrollHandler = this._onScroll.bind (this);
+			window.addEventListener ('scroll', this._onScrollHandler );
+		}
+
+		this.hash = Vn.Hash;
+		this.formParam = new Vn.HashParam ({key: 'form'});
+		this.formParam.on ('changed', this._onFormChange, this);
+		
+		if (!Vn.Cookie.check ('hedera_cookies'))
+		{
+			Vn.Cookie.set ('hedera_cookies', true);
+			Htk.Toast.showWarning (_('By using this site you accept cookies'));
+		}
 	}
 	
 	,hide: function ()
 	{
+		if (!this._shown)
+			return;
+	
+		this._shown = false;
+
+		if (Vn.isMobile ())
+			window.removeEventListener ('scroll', this._onScrollHandler);
+
+		this.formParam.unref ();
 		this.closeForm ();
 		this.hideMenu ();
 		Vn.Node.remove (this.node);
+		Vn.excludeCss ('js/hedera/gui.css');
 	}
 	
 	,logout: function ()
@@ -91,45 +115,20 @@ Vn.Gui = new Class
 	
 	,onLogoutClick: function ()
 	{
-		this._conn.close (this.onConnClose.bind (this));
+		this._conn.close (this._onConnClose.bind (this));
 	}
 	
-	,onConnClose: function ()
+	,_onConnClose: function ()
 	{
 		this.signalEmit ('logout');
 	}
 
-	,showBackground: function ()
+	,_onConnLoadChange: function (conn, isLoading)
 	{
-		Vn.Node.addClass (this.$('background'), 'show');
-	}
-
-	,hideBackground: function ()
-	{
-		Vn.Node.removeClass (this.$('background'), 'show');
-	}
-
-	,showMenu: function ()
-	{
-		this.showBackground ();
-		Vn.Node.addClass (this.$('left-panel'), 'show');
-		this.menuShown = true;
-
-		this.hideMenuCallback = this.hideMenu.bind (this);
-		document.addEventListener ('click', this.hideMenuCallback);
-	}
-
-	,hideMenu: function ()
-	{
-		if (!this.menuShown)
-			return;
-	
-		this.hideBackground ();
-		Vn.Node.removeClass (this.$('left-panel'), 'show');
-		this.menuShown = false;
-		
-		document.removeEventListener ('click', this.hideMenuCallback);
-		this.hideMenuCallback = null;
+		if (isLoading)
+			this.loaderPush ();
+		else
+			this.loaderPop ();
 	}
 
 	,onMainQueryDone: function (resultSet)
@@ -199,14 +198,79 @@ Vn.Gui = new Class
 		this._onFormChange ();
 	}
 
-	,_onConnLoadChange: function (conn, isLoading)
+	//++++++++++++++++++++++++++++++++++++++++++++++++++++++ Navigation bar
+	
+	,_onScroll: function ()
 	{
-		if (isLoading)
-			this.loaderPush ();
-		else
-			this.loaderPop ();
+		if (this._scrollTimeout === null)
+			this._scrollTimeout = setTimeout (
+				this._scrollTimeoutFunc.bind (this), 300);
 	}
 	
+	,_scrollTimeoutFunc: function ()
+	{
+		if (!this._shown)
+			return;
+		
+		var navbar = this.$('top-bar');
+		var yOffset = Vn.Browser.getPageYOffset ();
+		var showNavbar = this._lastYOffset > yOffset || yOffset < navbar.offsetHeight;
+		
+		if (showNavbar !== this._navbarVisible)
+		{
+			if (showNavbar)
+				var translateY = 0;
+			else
+				var translateY = -navbar.offsetHeight;
+
+			navbar.style.transform =
+				'translateZ(0) translateY('+ translateY +'px)';
+		}
+		
+		this._navbarVisible = showNavbar;
+		this._lastYOffset = yOffset;
+		this._scrollTimeout = null;
+	}
+
+	//++++++++++++++++++++++++++++++++++++++++++++++++++++++ Background
+
+	,showBackground: function ()
+	{
+		Vn.Node.addClass (this.$('background'), 'show');
+	}
+
+	,hideBackground: function ()
+	{
+		Vn.Node.removeClass (this.$('background'), 'show');
+	}
+
+	//++++++++++++++++++++++++++++++++++++++++++++++++++++++ Menu
+
+	,showMenu: function ()
+	{
+		this.showBackground ();
+		Vn.Node.addClass (this.$('left-panel'), 'show');
+		this.menuShown = true;
+
+		this.hideMenuCallback = this.hideMenu.bind (this);
+		document.addEventListener ('click', this.hideMenuCallback);
+	}
+
+	,hideMenu: function ()
+	{
+		if (!this.menuShown)
+			return;
+	
+		this.hideBackground ();
+		Vn.Node.removeClass (this.$('left-panel'), 'show');
+		this.menuShown = false;
+		
+		document.removeEventListener ('click', this.hideMenuCallback);
+		this.hideMenuCallback = null;
+	}
+
+	//++++++++++++++++++++++++++++++++++++++++++++++++++++++ Spinner
+	
 	,loaderPush: function ()
 	{
 		this.loadingCount++;
@@ -303,7 +367,7 @@ Vn.Gui = new Class
 	
 	,_onFormChange: function ()
 	{
-		var formPath = this.hashParam.value;
+		var formPath = this.formParam.value;
 		
 		if (!formPath)
 			formPath = Vn.Config['default_form'];
@@ -472,13 +536,13 @@ Vn.Gui = new Class
 			Vn.Cookie.unset ('hedera_supplant');
 		}
 	}
-	
+
 	,onSupplantExitClick: function ()
 	{
 		var query = 'UPDATE user_session_view SET user_id = account.user_get_id ()'
 		this._conn.execQuery (query, this.supplantExit.bind (this));
 	}
-	
+
 	,supplantExit: function ()
 	{
 		this._supplantClear ();
@@ -489,9 +553,7 @@ Vn.Gui = new Class
 
 	,_destroy: function ()
 	{
-		Vn.excludeCss ('js/hedera/gui.css');
 		this.hide ();
-		this.hashParam.unref ();
 		this.parent ();
 	}
 });
diff --git a/web/js/hedera/login.js b/web/js/hedera/login.js
index a8c84f7d..25ee22c1 100755
--- a/web/js/hedera/login.js
+++ b/web/js/hedera/login.js
@@ -85,14 +85,15 @@ Vn.Login = new Class
 		);
 	}
 	
-	,_onConnOpen: function (conn, success)
+	,_onConnOpen: function (conn, success, error)
 	{
 		this.$('pass').value = '';
 
-		if (!success)
-			Htk.Toast.showError (_('Invalid login'));
-		else
+		if (success)
 			this.signalEmit ('login');
+		else
+		if (error instanceof Vn.Error && error.domain === 'Auth')
+			Htk.Toast.showError (_('Invalid login'));
 
 		this._focusUserInput ();
 	}
diff --git a/web/js/hedera/style.css b/web/js/hedera/style.css
index 5b0f0ed8..d55e97f8 100755
--- a/web/js/hedera/style.css
+++ b/web/js/hedera/style.css
@@ -1,25 +1,40 @@
 
 /* Responsive */
 
+/* Standard */
 @media screen
 {
 	body { font-size: 11pt; }
 }
+
+/* Desktop - Laptop 1360x768 */
 @media (max-resolution: 119dpi) and (min-device-width: 1340px)
 {
 	body { font-size: 12pt; }
 }
+
+/* Desktop - FHD 1920x1080 */
 @media (max-resolution: 119dpi) and (min-device-width: 1900px)
 {
 	body { font-size: 13pt; }
 }
-@media (min-resolution: 120dpi) and (orientation: portrait)
+
+/* Mobile - HD 720x1280 */ /* 384/640 */
+
+@media
+	(min-resolution: 120dpi) and (orientation: portrait) and (min-device-width: 360px),
+	(min-resolution: 120dpi) and (orientation: landscape) and (min-device-width: 635px)
 {
 	body { font-size: 11pt; }
 }
-@media (min-resolution: 120dpi) and (orientation: landscape)
+
+/* Mobile - Lower than HD */
+
+@media
+	(min-resolution: 120dpi) and (orientation: portrait) and (max-device-width: 359px), 
+	(min-resolution: 120dpi) and (orientation: landscape) and (max-device-width: 634px) 
 {
-	body { font-size: 11pt; }
+	body { font-size: 9pt; }
 }
 
 /* Global */
diff --git a/web/js/hedera/tpv.js b/web/js/hedera/tpv.js
index 562e6380..0c1984e0 100755
--- a/web/js/hedera/tpv.js
+++ b/web/js/hedera/tpv.js
@@ -21,42 +21,56 @@ Vn.Tpv =
 	{	
 		if (amount > 0)
 		{
-			var query = 'CALL transaction_start (#company, #amount)';
-
-			var batch = new Sql.Batch ();
-			batch.addValue ('company', company);
-			batch.addValue ('amount', parseInt (amount * 100));
-			
-			conn.execQuery (query,
-				this._onTransactionStart.bind (this), batch);
+			var request = new Vn.HttpRequest ();
+			request.add
+			({
+				 'action': 'tpv'
+				,'amount': parseInt (amount * 100)
+				,'urlOk': this._makeUrl ('ok')
+				,'urlKo': this._makeUrl ('ko')
+				,'company': company
+			});
+		
+			request.send ('rest.php',
+				this._onTransactionStart.bind (this, request));
 		}
 		else if (!isNaN (amount))
 			Htk.Toast.showError (_('AmountError'));
 	}
 
-	,_onTransactionStart: function (resultSet)
+	,_onTransactionStart: function (request, success)
 	{
-		var res = resultSet.fetchResult ();
+		var data = null;
+		var error = null;
+	
+		if (success)
+		try {
+			var json = request.getJson ();
+			var data = json.data;
+			
+			if (json.error)
+				error = new Vn.Error (
+					json.error.domain,
+					json.error.code,
+					json.error.message);
+		}
+		catch (e)
+		{
+			error = e;
+		}
 
-		if (res && res.next ())
+		if (success && data)
 		{
 			var form = document.createElement ('form');
 			form.method = 'post';
-			form.action = res.get ('url');
+			form.action = data.url;
 			document.body.appendChild (form);
 			
 			var fieldsMap =
 			{
-				 'Ds_Merchant_Amount': 'amount'
-				,'Ds_Merchant_Order': 'ds_order'
-				,'Ds_Merchant_MerchantCode': 'id'
-				,'Ds_Merchant_Currency': 'currency'
-				,'Ds_Merchant_TransactionType': 'transaction_type'
-				,'Ds_Merchant_Terminal': 'terminal'
-				,'Ds_Merchant_MerchantURL': 'merchant_url'
-				,'Ds_Merchant_MerchantSignature': 'signature'
-				,'Ds_Merchant_UrlOK': null
-				,'Ds_Merchant_UrlKO': null
+				 'Ds_SignatureVersion': 'HMAC_SHA256_V1'
+				,'Ds_MerchantParameters': data.params
+				,'Ds_Signature': data.signature
 			};
 
 			for (var field in fieldsMap)
@@ -67,12 +81,8 @@ Vn.Tpv =
 				form.appendChild (input);
 				
 				if (fieldsMap[field])			
-					input.value = res.get (fieldsMap[field]);
+					input.value = fieldsMap[field];
 			}
-
-			var transactionId = res.get ('ds_order');
-			form['Ds_Merchant_UrlOK'].value = this._makeUrl ('ok', transactionId);
-			form['Ds_Merchant_UrlKO'].value = this._makeUrl ('ko', transactionId);
 			
 			form.submit ();
 		}
@@ -89,7 +99,7 @@ Vn.Tpv =
 		path += Vn.Hash.make ({
 			'form': 'ecomerce/orders',
 			'tpv_status': status,
-			'tpv_order': order
+			'tpv_order': '%s'
 		}, true);
 
 		return path;
diff --git a/web/js/htk/image-editor.js b/web/js/htk/image-editor.js
index b39b5b87..5f31a6bd 100755
--- a/web/js/htk/image-editor.js
+++ b/web/js/htk/image-editor.js
@@ -3,7 +3,8 @@ Vn.resource ('js/htk/image-editor.xml');
 Vn.define (function () {
 
 /**
- * A form to handle the image database, it allows to add new images or replace it
+ * A form to handle the image database, it allows to add new images or
+ * replace it.
  **/
 Htk.ImageEditor = new Class
 ({
diff --git a/web/js/htk/popup.js b/web/js/htk/popup.js
index 6261c963..7d090396 100755
--- a/web/js/htk/popup.js
+++ b/web/js/htk/popup.js
@@ -112,7 +112,7 @@ Htk.Popup = new Class
 		this._isOpen = true;
 		document.body.appendChild (this.node);
 		this.reset ();
-		setTimeout (this._onResetTimeout.bind (this), 200);
+		setTimeout (this._onResetTimeout.bind (this), 0);
 	}
 	
 	,_onOpacityTimeout: function ()
diff --git a/web/js/htk/style.css b/web/js/htk/style.css
index 52e2423d..9a46256d 100755
--- a/web/js/htk/style.css
+++ b/web/js/htk/style.css
@@ -295,11 +295,8 @@ td.cell-image img
 	background-color: #FFF;
 	text-align: center;
 	box-shadow: 0 0 0.4em #666;
-}
-.htk-full-image,
-.htk-full-image > img
-{
 	border-radius: .2em;
+	overflow: hidden;
 }
 .htk-full-image-loader
 {
@@ -314,6 +311,7 @@ td.cell-image img
 	box-shadow: 0 0 0.4em #666;
 	height: 1.8em;
 	border-radius: 50%;
+	overflow: hidden;
 }
 
 /* Toast */
diff --git a/web/js/vn/hash-param.js b/web/js/vn/hash-param.js
index 0f308c3a..e83fd97d 100755
--- a/web/js/vn/hash-param.js
+++ b/web/js/vn/hash-param.js
@@ -37,7 +37,7 @@ Vn.HashParam = new Class
 			type: Object
 			,set: function (x)
 			{
-				this._value = x;
+				this._setValue (x, true);
 			}
 			,get: function ()
 			{
@@ -59,7 +59,8 @@ Vn.HashParam = new Class
 		}
 	}
 	
-	,_lock: false
+	,_hashLock: false
+	,_paramLock: false
 	,_value: undefined
 	,_key: null
 	,_type: null
@@ -74,12 +75,15 @@ Vn.HashParam = new Class
 
 	,_onHashChange: function ()
 	{	
-		if (!this._key || !this._listener)
+		if (this._hashLock || !this._key || !this._listener)
 			return;
 
 		var newValue = Vn.Hash.get (this._key);
 		
-		if (this._type)
+		if (newValue === '')
+			newValue = null;
+		
+		if (this._type && newValue !== undefined && newValue !== null)
 		switch (this._type)
 		{
 			case Boolean:
@@ -90,35 +94,53 @@ Vn.HashParam = new Class
 				break;
 		}
 
-		if (this._value != newValue)
-		{
-			this._value = newValue;
-			this.signalEmit ('changed');
-			this._refreshParam ();
-		}
+		this._hashLock = true;
+		this._setValue (newValue, true);
+		this._hashLock = false;
 	}
 	
+	,_setValue: function (newValue, signal)
+	{
+		if (newValue == this._value)
+			return;
+
+		this._value = newValue;
+
+		if (this._key && !this._hashLock)
+		{
+			this._hashLock = true;
+
+			var map = {};
+			map[this._key] = newValue;
+			Vn.Hash.add (map);
+
+			this._hashLock = false;
+		}
+		
+		this._refreshParam ();
+		
+		if (signal)
+			this.signalEmit ('changed');
+	}
+
 	,_refreshParam: function ()
 	{
-		if (this._param && !this._lock)
+		if (this._param && !this._paramLock)
 		{
-			this._lock = true;
+			this._paramLock = true;
 			this._param.value = this._value;
-			this._lock = false;
+			this._paramLock = false;
 		}
 	}
 	
 	,_onParamChange: function ()
 	{
-		if (this._lock)
+		if (this._paramLock)
 			return;
 
-		var map = {};
-		map[this.key] = this._param.value;
-
-		this._lock = true;
-		Vn.Hash.add (map);
-		this._lock = false;
+		this._paramLock = true;
+		this._setValue (this._param.value);
+		this._paramLock = false;
 	}
 });
 
diff --git a/web/js/vn/url.js b/web/js/vn/url.js
index 5371b8bd..6b9a44d5 100755
--- a/web/js/vn/url.js
+++ b/web/js/vn/url.js
@@ -62,9 +62,11 @@ Vn.Url =
 		
 			if (post.length > 2)
 				post += '&';
-
+				
+			if (value === null || value === undefined)
+				continue;
 			if (typeof value == 'boolean')
-				value = new Number (value);
+				value = value ? '1' : '0';
 
 			post += key +'='+ encodeURIComponent (value);
 		}
diff --git a/web/locale/ca/js/hedera.js b/web/locale/ca/js/hedera.js
index 3f641a56..c7a7bcaf 100755
--- a/web/locale/ca/js/hedera.js
+++ b/web/locale/ca/js/hedera.js
@@ -9,8 +9,8 @@ Vn.Locale.add
 	,"Login mail": "clientes@verdnatura.es"
 	,"Login phone": "+34 607 562 391"
 	
-	,"You've been too idle": "Has estat massa temps inactiu i la sessió ha expirat."
-	,"Invalid login": "Usuari o contrasenya incorrectes. Recorda que s'hi distingeix entre majúscula i minúscula."
+	,"You've been too idle": "Has estat massa temps inactiu i la sessió ha expirat"
+	,"Invalid login": "Usuari o contrasenya incorrectes, recorda que s'hi distingeix entre majúscula i minúscula"
 	,"There was an internal error": "S'ha produït un error intern"	
 
 	,"Menu": "Menú"
diff --git a/web/locale/en/js/hedera.js b/web/locale/en/js/hedera.js
index dc300a97..65df8ac5 100755
--- a/web/locale/en/js/hedera.js
+++ b/web/locale/en/js/hedera.js
@@ -9,8 +9,8 @@ Vn.Locale.add
 	,"Login mail": "clientes@verdnatura.es"
 	,"Login phone": "+34 607 562 391"
 
-	,"You've been too idle": "You have been idle too long and your session has expired."
-	,"Invalid login": "Username or password incorrect. Remember that it is case-sensitive."
+	,"You've been too idle": "You have been idle too long and your session has expired"
+	,"Invalid login": "Username or password incorrect, remember that it is case-sensitive"
 	,"There was an internal error": "There was an internal error"
 
 	,"Menu": "Menu"
diff --git a/web/locale/es/js/hedera.js b/web/locale/es/js/hedera.js
index 4b556409..af7aa771 100755
--- a/web/locale/es/js/hedera.js
+++ b/web/locale/es/js/hedera.js
@@ -9,8 +9,8 @@ Vn.Locale.add
 	,"Login mail": "clientes@verdnatura.es"
 	,"Login phone": "+34 963 242 100"
 
-	,"You've been too idle": "Has estado demasiado tiempo inactivo y la sesión ha expirado."
-	,"Invalid login": "Usuario o contraseña incorrectos. Recuerda que se hace distinción entre mayúsculas y minúsculas."
+	,"You've been too idle": "Has estado demasiado tiempo inactivo y la sesión ha expirado"
+	,"Invalid login": "Usuario o contraseña incorrectos, recuerda que se hace distinción entre mayúsculas y minúsculas"
 	,"There was an internal error": "Se ha producido un error interno"
 
 	,"Menu": "Menú"
diff --git a/web/locale/fr/js/hedera.js b/web/locale/fr/js/hedera.js
index 982d6ef9..cb913dd4 100755
--- a/web/locale/fr/js/hedera.js
+++ b/web/locale/fr/js/hedera.js
@@ -9,8 +9,8 @@ Vn.Locale.add
 	,"Login mail": "ruben@verdnatura.es"
 	,"Login phone": "+33 781 533 900"
 
-	,"You've been too idle": "Il a eu le temps de trop paresseux et votre session a expiré."
-	,"Invalid login": "Utilisateur ou mot de passe incorrect. N'oubliez pas de distinction entre majuscules et minuscules."
+	,"You've been too idle": "Il a eu le temps de trop paresseux et votre session a expiré"
+	,"Invalid login": "Utilisateur ou mot de passe incorrect, n'oubliez pas de distinction entre majuscules et minuscules"
 	,"There was an internal error": "Il ya eu une erreur interne"
 
 	,"Menu": "Menu"
diff --git a/web/locale/mn/js/hedera.js b/web/locale/mn/js/hedera.js
index c1390c6d..cda44b2c 100755
--- a/web/locale/mn/js/hedera.js
+++ b/web/locale/mn/js/hedera.js
@@ -9,8 +9,8 @@ Vn.Locale.add
 	,"Login mail": "clientes@verdnatura.es"
 	,"Login phone": "+34 607 562 391"
 
-	,"You've been too idle": "Та нар ч бас зогссон байсан, чуулган хугацаа дууссан байна."
-	,"Invalid login": "Хэрэглэгчийн нэр эсвэл нууц үг буруу. Тэр хэргийг мэдрэмтгий гэдгийг санаарай."
+	,"You've been too idle": "Та нар ч бас зогссон байсан, чуулган хугацаа дууссан байна"
+	,"Invalid login": "Хэрэглэгчийн нэр эсвэл нууц үг буруу, Тэр хэргийг мэдрэмтгий гэдгийг санаарай"
 	,"There was an internal error": "Дотоод алдаа гарлаа"
 
 	,"Menu": "Цэс"
diff --git a/web/locale/pt/js/hedera.js b/web/locale/pt/js/hedera.js
index 479da57d..18b17f53 100644
--- a/web/locale/pt/js/hedera.js
+++ b/web/locale/pt/js/hedera.js
@@ -10,7 +10,7 @@ Vn.Locale.add
 	,"Login phone": "+34 963 242 100"
 
 	,"You've been too idle": "Muito tempo de inatividade, a sessão foi finalizada"
-	,"Invalid login": "Usuário ou Palavra-Passe incorreto. Lembre-se de diferenciar maiusculas e minusculas."
+	,"Invalid login": "Usuário ou Palavra-Passe incorreto, lembre-se de diferenciar maiusculas e minusculas"
 	,"There was an internal error": "Houve um erro interno"
 
 	,"Menu": "Menú"
diff --git a/web/rest.php b/web/rest.php
index f20207f3..3f4754fe 100755
--- a/web/rest.php
+++ b/web/rest.php
@@ -56,9 +56,7 @@ Rest\Service::init ();
 
 try {
 	Web::init ();
-
-	if (!Web::login ())
-		throw new Rest\Exception ('Auth', 'sessionExpired', s('SessionExpired'));
+	Web::login ();
 
 	// Checking the client version
 
@@ -100,9 +98,17 @@ try {
 			Rest\Service::setData ($module->run ());
 		}
 		else
-			throw new Rest\Exception ('Rest', 'invalidAction', s('InvalidAction'));
+			throw new Rest\Exception ('Rest', 'invalidAction', s('Invalid action'));
 	}
 }
+catch (Vn\Web\SessionExpiredException $e)
+{
+	Rest\Service::setError ('Auth', 'sessionExpired', s('The session has expired'));
+}
+catch (Vn\Web\BadLoginException $e)
+{
+	Rest\Service::setError ('Auth', 'badLogin', s('Invalid login'));
+}
 catch (Rest\Exception $e)
 {
 	Rest\Service::setError ($e->getDomain (), $e->getCode (), $e->getMessage ());
diff --git a/web/rest/tpv.php b/web/rest/tpv.php
new file mode 100755
index 00000000..d01ae0f7
--- /dev/null
+++ b/web/rest/tpv.php
@@ -0,0 +1,37 @@
+<?php
+
+require_once ('vn/tpv/tpv.php');
+
+use Vn\Rest;
+use Vn\Tpv;
+
+class RestMod extends Rest\Module
+{
+	function run ()
+	{		
+		if (empty ($_REQUEST['amount']))
+			throw new Rest\Exception  ('Tpv', 'badRequest', s('Bad request'));
+
+
+		$params = Tpv::transactionStart (
+			  $this->conn
+			 ,(int) $_REQUEST['amount']
+			 ,empty ($_REQUEST['urlOk']) ? NULL : $_REQUEST['urlOk'] 
+			 ,empty ($_REQUEST['urlKo']) ? NULL : $_REQUEST['urlKo']
+			 ,empty ($_REQUEST['company']) ? NULL : $_REQUEST['company']
+			 ,$url
+			 ,$signature
+		);
+		
+		$result = [
+			 'url'       => $url
+			,'params'    => $params
+			,'signature' => $signature
+		];
+		trigger_error (print_r ($result, TRUE));
+
+		return $result;
+	}
+}
+
+?>