function chkmenu(menubackid){
    var menuback = document.getElementById(menubackid);
    menuback.style.background="url(/images/top_menu_3b.gif)";
//      alert(menuback.style.background);
  }
  function outmenu(menubackid){
    var menuback = document.getElementById(menubackid);
   // if(menubackid!=1){
	  menuback.style.background="url(/images/top_menu_3a.gif)";
 //  }
  }

 var $ = function(o){return document.getElementById(o);}
  window.onload = function(){
   window.onscroll = function(){
    var scrollTop = document.documentElement.scrollTop;
    if(scrollTop){
     $("sl").style.display = 'block';
     $("sl").style.top = (scrollTop + document.documentElement.clientHeight - 80)+ "px";
    }else{
     $("sl").style.display = 'none';
    }
   }
  }