function ShowElement(id)
{
   var element = document.getElementById(id);
   
   var elShow  = 'none';
   if( element.style.display == elShow)
      elShow = 'block';
     
   element.style.display = elShow;
}

over = function() {

   var sfEls = document.getElementById("menu").getElementsByTagName("LI");

   for (var i=0; i<sfEls.length; i++) {
      sfEls[i].onmouseover=function() {
         this.className+=" over";
         this.style.zIndex='9999999';
      }
      sfEls[i].onmouseout=function() {
         this.className=this.className.replace(new RegExp(" over"), "");
         this.style.zIndex='1';
      }
   }
}
if (window.attachEvent)
    window.attachEvent("onload", over);