loadTopMenu = function() 
{	
if (document.all&&document.getElementById) 
 {		
  menunavParent = document.getElementById("nav");	
	
   for (x=0; x < menunavParent.childNodes.length; x++) 
     {		
        menunode = menunavParent.childNodes[x];
			
           if (menunode.nodeName=="LI") 
             {			
              menunode.onmouseover=function() 
                {				
                this.className+=" over";			
                }			
                menunode.onmouseout=function() 
                {				
                  this.className=this.className.replace(" over", "");
	  }
           }
        }
     }
}

window.onload=loadTopMenu;