TOMMYHU

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;
}
}

  <script type="text/javascript" src="scrollDoor.js"></script>