function controlPie(){
		var alto1 = document.body.clientHeight;
		var alto2 = document.documentElement.clientHeight;	
		//alert(alto1);
		//alert(alto2);
		var resto = (alto2 - alto1) + 76;
		
		if (alto1<alto2){
		document.getElementById('footer').style.height = resto + "px";
		}
}

sfHover = function() {
	var sfEls = document.getElementById("cabecera").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);