//隐藏子菜单
  this.hideMenu=function(){
   if(menu.selectedIndex==-1) return;
   menu.barItems[menu.selectedIndex].className=id+"_barItem";
   menu.pads[selectedIndex].style.display="none";
   menu.selectedIndex=-1;
   menu.board.style.display="none";
  }

  //执行菜单命令;
  this.execute=function(ary){
   if(ary==null) return;
   if(ary=="js") { eval(ary); menu.hideMenu(); }
   else if(ary==null || ary.toLowerCase=="_self") location.href=ary;
   else{ var x=window.open(ary,ary); x.focus(); }
  }

  //建立子菜单的显示面板
  this.crtMenuBoard=function(){
   document.write(
    "<div id='"+id+"_board' style='position:absolute;width:160px;height:10px;left:0px;top:20px;background-color:#666666;z-index:99;display:none;'>"+
     "<div style='position:absolute;width:100%;height:100%;left:0px;top:0px;'>"+
      "<iframe id='"+id+"_frame' name='"+id+"_frame' width='100%' height='100%' frameborder='0' scrolling='no'></iframe>"+
     "</div>"+
     "<div id='"+id+"_pad' style='position:absolute;width:100%;height:100%;left:0px;top:0px;'></div>"+
    "</div>"
   );
   menu.board=document.getElementById(id+"_board");
   menu.pad=document.getElementById(id+"_pad");
   menu.pad.className=id+"_board";
   menu.pad.onselectstart=function(){ return false;}
  }

  //增加对像的一个子元素
  this.crtElement=function(el,p){
   return p.appendChild(document.createElement(el));
  }

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