topHover = function() {

    if(document.getElementById('Menu1_nav')!=null)
    {
        if(document.getElementById('Menu1_nav').getElementsByTagName("li")!= null)
        {
                var topEls = document.getElementById('Menu1_nav').getElementsByTagName("li");
	            for (var i=0; i<topEls.length; i++) {
		            topEls[i].onmouseover=function() {
			            this.className+=" sfhover";
		            }
		            topEls[i].onmouseout=function() {
			            this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		            }
	            }
	    }
	}
}
if (window.attachEvent) window.attachEvent("onload", topHover);