Htk.ColumnCheck = new Class
({
	Extends: Htk.Column
	,Tag: 'htk-column-check'

	,render: function (tr)
	{
		var checkButton = document.createElement ('input');
		checkButton.type = 'checkbox';
		checkButton.checked = this.value;
	
		if (this.editable)
			checkButton.addEventListener ('changed',
				this.inputChanged.bind (this, tr, node));
		else
			checkButton.disabled = true;

		var td = this.parent (tr);
		td.style.textAlign = 'center';
		td.appendChild (checkButton);
		return td;
	}
	
	,inputChanged: function (tr, node)
	{
		this.changed (tr, node.value);
	}
});