function CallBackObject()   
{   
    this.XmlHttp = this.GetHttpObject();   
}   
  
CallBackObject.prototype.GetHttpObject = function()   
{   
    var xmlhttp;   
    /*@cc_on  
    @if (@_jscript_version >= 5)  
    try   
    {  
        xmlhttp = new ActiveXObject("Msxm12.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;   
}   
  
CallBackObject.prototype.DoCallBack = function(eventTarget,eventArgument)   
{   
	var theData = '';
    var theform = document.forms[0];
    var thePage = window.location.pathname + window.location.search;
    var eName = '';   

    theData  = '__EVENTTARGET='  + escape(eventTarget.split("$").join(":")) + '&';
    theData += '__EVENTARGUMENT=' + eventArgument + '&';
    theData += '__VIEWSTATE=' + escape(theform.__VIEWSTATE.value).replace(new RegExp('\\+', 'g'), '%2b') + '&';
    theData += 'IsCallBack=true&';
    for (var i=0; i<theform.elements.length; i++)
    {
        eName = theform.elements[i].name;
        if (eName && eName != '')
        {
            if (eName == '__EVENTTARGET' || eName == '__EVENTARGUMENT' || eName == '__VIEWSTATE' )
            {
                // Do Nothing
            }
            else
            {
                theData = theData + escape(eName.split("$").join(":")) + '=' + theform.elements[i].value;
                if( i != theform.elements.length - 1 )
                    theData = theData + '&';
            }
        }
    }    

    if (this.XmlHttp)
    {
        if( this.XmlHttp.readyState == 4 || this.XmlHttp.readyState == 0 )
        {
            var oThis = this;
            this.XmlHttp.open('POST', thePage, true);
            this.XmlHttp.onreadystatechange = function(){ oThis.ReadyStateChange(); };
            this.XmlHttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
            this.XmlHttp.send(theData);
        }
    } 
}   
  
CallBackObject.prototype.AbortCallBack = function()   
{   
    if(this.XmlHttp)   
    {   
        this.XmlHttp.abort();   
    }       
}   
  
CallBackObject.prototype.OnLoading = function()   
{   
    //Loading   
}   
  
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.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.OnComplete(this.XmlHttp.responseText,this.XmlHttp.responseXML);   
        }   
        else  
        {   
            this.OnError(this.XmlHttp.status,this.XmlHttp.statusText,this.XmlHttp.responseText);   
        }   
    }   
}