Event.observe(window, 'load', function(e) {
	var barras=$$(".barra");
	
	barras.each(function(barra) {
		var ancho=barra.getStyle("width");
		var color=barra.getStyle("background-color");
		barra.setStyle("display: block; width: 0px; background-color: #8a8a8a;");
		new Effect.Morph(barra, { style: 'width: '+ancho+'; background-color: '+color,
									duration: 1
		});
	});
});