function menuhover()
{
 if(!document.getElementById("men"))
 return;
 var lis = document.getElementById("men").getElementsByTagName("em");
 for (var i=0;i<lis.length;i++)
 {
 lis[i].onmouseover=function(){this.className+="hover";}
 lis[i].onmouseout=function() {this.className=this.className.replace(new RegExp("hover\\b"), "");}
 }
}