function scrollDoor(){
}
scrollDoor.prototype = {
 sd : function(menus,divs,openClass,closeClass){
  var _this = this;
  if(menus.length != divs.length)
  {
   alert("菜单层数量和内容层数量不一样!");
   return false;
  }    
  for(var i = 0 ; i < menus.length ; i++)
  { 
   _this.$(menus[i]).value = i;    
   _this.$(menus[i]).onmouseover = function(){

    for(var j = 0 ; j < menus.length ; j++)
    {      
     _this.$(menus[j]).className = closeClass;
     _this.$(divs[j]).style.display = "none";
    }
    _this.$(menus[this.value]).className = openClass; 
    _this.$(divs[this.value]).style.display = "block";    
   }
  }
  },
 $ : function(oid){
  if(typeof(oid) == "string")
  return document.getElementById(oid);
  return oid;
 }
}
window.onload = function(){
  var SDmodel1 = new scrollDoor();
//m06表示控制改变节点id
//c06表示是否显示层的id
//sd01表示没有背景的样式表名称 background-image:url(mt.gif)
//sd02表示有背景的样式表名称 background-image:url(yt.gif)
 SDmodel1.sd(["ka","kb","kc"],["bka","bkb","bkc"],"btnl","btnh");
 var SDmodel2 = new scrollDoor();
 SDmodel2.sd(["kapic","kbpic","kcpic","kdpic"],["bkapic","bkbpic","bkcpic","bkdpic"],"csa","csb");
}