function CallBackObject()
{
  this.XmlHttp = this.GetHttpObject();
  this.div = document.createElement("div");
  this.div.style.position = "absolute";
  this.div.style.left = (document.documentElement.clientWidth /2 + document.documentElement.scrollLeft) + "px";
  this.div.style.top = (document.documentElement.clientHeight /3 + document.documentElement.scrollTop) + "px";
  this.div.style.zIndex = 2000;
}
 
CallBackObject.prototype.GetHttpObject = function()
{ 
  var xmlhttp;
  /*@cc_on
  @if (@_jscript_version >= 5)
    try {
      xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
      try {
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (E) {
        xmlhttp = false;
      }
    }
  @else
  xmlhttp = false;
  @end @*/
  if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
    try {
      xmlhttp = new XMLHttpRequest();
    } catch (e) {
      xmlhttp = false;
    }
  }
  return xmlhttp;
}
//get方法
CallBackObject.prototype.DoCallBackGet = function(URL)
{ 
  if( this.XmlHttp )
  {
    if( this.XmlHttp.readyState == 4 || this.XmlHttp.readyState == 0 )
    {
      var oThis = this;
      this.XmlHttp.open('GET', URL);
      this.XmlHttp.onreadystatechange = function(){ oThis.ReadyStateChange(); };
      this.XmlHttp.send(null);
    }
  }
}
//post方法
CallBackObject.prototype.DoCallBackPost = function(URL,Form)
{ 
  if( this.XmlHttp )
  {
    if( this.XmlHttp.readyState == 4 || this.XmlHttp.readyState == 0 )
    {
       var oThis = this;
      this.XmlHttp.open('POST', URL,true);
      this.XmlHttp.onreadystatechange = function(){ oThis.ReadyStateChange(); };
      this.XmlHttp.setRequestHeader("Content-type","application/x-www-form-urlencoded;charset=UTF-8");
      this.XmlHttp.send(Form);
    }
  }
}
 
CallBackObject.prototype.AbortCallBack = function()
{
  if( this.XmlHttp )
    this.XmlHttp.abort();
}
 
CallBackObject.prototype.OnLoading = function()
{
      
}
 
CallBackObject.prototype.OnLoaded = function()
{
  // Loaded    
}
 
CallBackObject.prototype.OnInteractive = function()
{
  // Interactive
}
CallBackObject.prototype.OnComplete = function(responseText, responseXml)
{
  // Complete
}
 
CallBackObject.prototype.OnAbort = function()
{
  // Abort
}
 
CallBackObject.prototype.OnError = function(status, statusText)
{
  // Error  
}
 
CallBackObject.prototype.ReadyStateChange = function()
{
  if( this.XmlHttp.readyState == 1 )
  {
    //this.div.innerHTML = "<img src=\"../images/system/loding.gif\" alt=\"\" />";
    //this.div.style.display = "";
    //document.body.appendChild(this.div);
    this.OnLoading();
  }
  else if( this.XmlHttp.readyState == 2 )
  {
   this.OnLoaded();
  }
  else if( this.XmlHttp.readyState == 3 )
  {
   this.OnInteractive();
  }
  else if( this.XmlHttp.readyState == 4 )
  {
    if( this.XmlHttp.status == 0 ){
      this.OnAbort();
    }
    else if( this.XmlHttp.status == 200 && this.XmlHttp.statusText == "OK" ){
      this.div.innerHTML = "";
      this.div.style.display = "none";
      this.OnComplete(this.XmlHttp.responseText, this.XmlHttp.responseXML);
    }
    else{
      this.OnError(this.XmlHttp.status, this.XmlHttp.statusText, this.XmlHttp.responseText);
    }
  }
}