overExplorer = function() 
	{
		var lista = document.getElementById("menudesplegable").getElementsByTagName("li");
		for (var i=0; i<lista.length; i++) 
			{
				lista[i].onmouseover=function() 
					{
					this.className+=" overExplorer";
					}
				lista[i].onmouseout=function() 
					{
					this.className=this.className.replace(new RegExp(" overExplorer\\b"), "");
					}
			}
	}
if (window.attachEvent) window.attachEvent("onload", overExplorer);