function initMenu(event,ul){
    if(!ul) ul = document.getElementById("menu");
     li = ul.getElementsByTagName("li");
    for(i=0;i<li.length;i++)
     {
         li[i].onmouseover = function(){
            try{
                this.className='over';
                this.getElementsByTagName("ul")[0].style.display="block";
             }catch(e){};
         }
         li[i].onmouseout = function(){
            try{
                this.className='out';
                this.getElementsByTagName("ul")[0].style.display="none";
             }catch(e){};
         }
     }
}
window.onload = initMenu;