var globalCallbacks = {
			onCreate: function(){
					Element.show('divCargando2');
					var posX= (screen.width - Element.getDimensions('divCargando2').width) / 2;
					var posY= (screen.height - Element.getDimensions('divCargando2').height) / 2;
					var cssProp= "{left:'"+posX+"px', top:'25px'}";
					eval("Element.setStyle('divCargando2',"+cssProp+");");
			},

			onComplete: function() {
					if(Ajax.activeRequestCount == 0){
						Element.hide('divCargando2');
					}
			}
	};

/* Se registran los callbacks en Ajax.Responders */
Ajax.Responders.register( globalCallbacks );