function getElementsByClassName(className, tag, elm){
	var testClass = new RegExp("(^|\\s)" + className + "(\\s|$)");
	var tag = tag || "*";
	var elm = elm || document;
	var elements = (tag == "*" && elm.all)? elm.all : elm.getElementsByTagName(tag);
	var returnElements = [];
	var current;
	var length = elements.length;
	for(var i=0; i<length; i++){
	current = elements[i];
	if(testClass.test(current.className)){
		returnElements.push(current);
	}
	}
	return returnElements;
}

function cambiar_imagen(){
	sel=getElementsByClassName('seleccionado');
	obj=sel[0].getElementsByTagName('img');
	o=obj[0].src;
	if(o.substr(o.length-5,1)=="2"){ estado="1"; }
	else { estado="2"; }
	nueva_foto=o.substr(0,o.length-5)+estado+".jpg";
	obj[0].src=nueva_foto;
}


sfHover = function() {
	var sfEls = document.getElementById("menu_desplegable").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);

window.onresize = function(){
	var sfEls = document.getElementById("menu_desplegable").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].className=sfEls[i].className;
	}
}