Event.observe(window, "load", 
	function(){
		//alert(document.body.clientWidth+" "+document.body.clientHeight);
		if ($("mestre")){
			if (document.body.clientWidth < '900') {
					Element.addClassName("mestre", "small");
					if ($("banner-superior")) Element.addClassName("banner-superior", "small");
					Element.hide("banner-lateral");
					
			}
			if (!$("banner-lateral")) {
				Element.addClassName("mestre", "small");
				if ($("banner-superior")) Element.addClassName("banner-superior", "small");
			}
		}
	});