function scrollDoor(){
}
scrollDoor.prototype = {
 sd : function(nav,content,openClass,closeClass){
  var _this = this;
  if(nav.length != content.length)
  {
   alert("滑动门菜单层数量和其对应的内容层数量不一样!");
   return false;
  }    
  for(var i = 0 ; i < nav.length ; i++)
  { 
   _this.$(nav[i]).value = i;    
   _this.$(nav[i]).onmouseover = function(){
     
    for(var j = 0 ; j < nav.length ; j++)
    {      
     _this.$(nav[j]).className = closeClass;
     _this.$(content[j]).style.display = "none";
    }
    _this.$(nav[this.value]).className = openClass; 
    _this.$(content[this.value]).style.display = "block";    
   }
  }
  },
 $ : function(oid){
  if(typeof(oid) == "string")
  return document.getElementById(oid);
  return oid;
 }
}
window.onload = function(){
 var SDmodel = new scrollDoor();
 SDmodel.sd(["py_a","py_b","py_c","py_d","py_e","py_f","py_g","py_h","py_i","py_j","py_k","py_l","py_m","py_n","py_o","py_p","py_q","py_r","py_s","py_t","py_u","py_v","py_w","py_x","py_y","py_z"],["city_a","city_b","city_c","city_d","city_e","city_f","city_g","city_h","city_i","city_j","city_k","city_l","city_m","city_n","city_o","city_p","city_q","city_r","city_s","city_t","city_u","city_v","city_w","city_x","city_y","city_z"],"curr","");
}