function setTab(m,n){
 var tli=document.getElementById("menu"+m).getElementsByTagName("li");
 var mli=document.getElementById("main"+m).getElementsByTagName("ul");
 for(i=0;i<tli.length;i++){
  tli[i].className=i==n?"hover":"";
  mli[i].style.display=i==n?"block":"none";
 }
}



 //²Ëµ¥Òþ²ØÓëÏÔʾ
 function SwitchMenu(obj){
  if(document.getElementById){
  var el = document.getElementById("Menu_"+obj);
  var ar = document.getElementById("Menu").getElementsByTagName("ul");
   if(el.style.display != "block"){
    for (var i=0; i<ar.length; i++){
     if (ar[i].className=="submenu")
     ar[i].style.display = "none";
     document.getElementById("Menu"+(i+1)).className="Menutbg_1 cursor"
    }
    el.style.display = "block";
    document.getElementById("Menu"+obj).className="Menutbg_2 cursor"
   }else{
    el.style.display = "none";
    document.getElementById("Menu"+obj).className="Menutbg_1 cursor"
   }
  }
 }