asp+ajax asp中ajax的中文乱码

function ClassList(id)
{
 if(id>0)
 {
  var url = "Inc/ClassList.asp?ParentId="+id+"&rd="+Math.random();
  xmlHttp=GetXmlHttpObject(stateChanged)
  xmlHttp.open("GET", url , true)
  xmlHttp.send(null)
 }
}

function stateChanged()
{
 if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
 {
  var txt=unescape(xmlHttp.responseText); /*在接收部分用js的编码转换*/
  if(txt!=null&&txt!="")
  {
   var ShuZu=new Array();
   var resp="";
   ShuZu=txt.split(",");
   for (var i=0;i < ShuZu.length; i++)
   {
    var lxsz=new Array();
    lxsz=ShuZu[i].split("|");
    resp=resp+"<a href="+lxsz[0]+">"+lxsz[1]+"</a>"
   }
   $("ErJiClass").innerHTML=resp;
  }
  else
  {
   $("ErJiClass").innerHTML="asdfasdf";
  }
 }
}

Response.Expires=-1
ParentId=Request.QueryString("ParentId")
Response.Write(escape(GetSmallClass("SmallClass",ParentId)))/*在发送部分用js转换*/