//when the dom is ready...
		window.addEvent('domready', function() {
			//time to implement basic show / hide
			Element.implement({
				//implement show
				show: function() {
					this.setStyle('display','');
				},
				//implement hide
				hide: function() {
					this.setStyle('display','none');
				},
				//implement fancy show
				fancyShow: function() {
					this.fade('in');
				},
				//implement fancy hide
				fancyHide: function() {
					this.fade('out');
				},
				showCabezera: function() {
				///*
					$('submenu_cabecera').setStyle('display','block');

					//this.setStyle('display','');
					//this.className = 'active';

				},
				//implement fancy hide
				hideCabezera: function() {
				///*
					$('submenu_cabecera').setStyle('display','none');

					//this.setStyle('display','');
					//this.className = 'active';
				}
			});
			if(typeof changePreview == 'function')changePreview('1');
		});