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


function cambio(id)
{
	jQuery(function ($) {
   
		$("#tagcloud").hide("fast");
		$("#comm").hide("fast");
		$("#feat").hide("fast");
		$("#colum").hide("fast");
		$("#pop").hide("fast");
		$(id).show("fast");
		 //Aqui tu codigo
	});
	
}