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;
 }
}
 function showlanmu(){
 var SDmodel = new scrollDoor();
 SDmodel.sd(["guoyou","jiti","siying","waizi","hezi","zhongwai","getihu"],["guoyounr","jitinr","siyingnr","waizinr","hezinr","zhongwainr","getihunr"],"zhixiang","jingzhi");


}