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 ,len=menus.length; i <len ; i++)
  { 
   _this.$(menus[i]).value = i;    
   _this.$(menus[i]).onmouseover = function(){
     
    for(var j = 0,len=menus.length ; j <len ; 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(["cpgqtopzs","cpgqmid"],["cpgqfoot","cpgqfoot1"],"dbt0","dbt1");
 SDmodel.sd(["esgqtopz","esgqmid"],["esgqfoot","esgqfoot1"],"dbt0","dbt1");
SDmodel.sd(["cqztopz","cqzmid"],["cqzfoot","cqzfoot1"],"dbt0","dbt1");
SDmodel.sd(["txfgtopz","txfgmid"],["txfgfoot","txfgfoot1"],"dbt0","dbt1");
SDmodel.sd(["ztbtopz","ztbmid"],["ztbfoot","ztbfoot1"],"dbt0","dbt1");
SDmodel.sd(["xmhztopz","xmhzmid"],["xmhzfoot","xmhzfoot1"],"dbt0","dbt1");
SDmodel.sd(["zzgqtopz","zzgqmid"],["zzgqfoot","zzgqfoot1"],"dbt0","dbt1");}