Hedera.DeliveryNote = new Class
({
	Extends: Hedera.Report
	
	,subtotalRenderer: function (column, form)
	{
		column.value = this.subtotal (form);
	}

	,subtotal: function (form)
	{
		var price = form.get ('price');
		var discount = form.get ('discount');
		return form.get ('quantity') * price * ((100 - discount) / 100);
	}
	
	,onPackagesChanged: function (model)
	{
		this.$('packages').node.style.display =
			model.numRows > 0 ? 'block' : 'none';
	}
});