//菜单隐藏与显示
 function SwitchcpMenu(obj){
  if(document.getElementById){
  var el = document.getElementById("cpMenu_"+obj);
  var ar = document.getElementById("cpMenu").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("cpMenu"+(i+1)).className="cpMenutbg_1 cursor"
    }
    el.style.display = "block";
    document.getElementById("cpMenu"+obj).className="cpMenutbg_2 cursor"
   }else{
    el.style.display = "none";
    document.getElementById("cpMenu"+obj).className="cpMenutbg_1 cursor"
   }
  }
 }