function oAjax( url ,callback)
{
    try{
        this.HttpRequest = null;
        this.Debug  = false;
        this.Url = url;
        this.ContentType = "text/xml;charset=UTF-8";
        this.HttpRequest = this.createXMLHttpRequest();
        this.yibu=true;
        if(callback==null)
            yibu=false;
        if ( this.HttpRequest == null )
        {
            this._debug("XMLHttpRequest create failure!");
            return;
        }

        var xhReq = this.HttpRequest;
        if(callback!=null){
        xhReq.onreadystatechange = function (){
                    oAjax._OnReadyStateChange( xhReq,callback );
            }
         }

    } catch(e){
       this._debug( "unknow err: " + e.message );
    }
}

/*
 * Get URL resource
 */
oAjax.prototype.Get = function() {

    this.SetContentType( "text/html;charset=UTF-8" );
    this._get();
}

/*
 * Post data to the server
 */
oAjax.prototype.Post = function( arrKey, arrValue ) {

    var data = '';
    this.SetContentType( "application/x-www-form-urlencoded;charset=UTF-8" );
    for( i = 0; i < arrKey.length; i ++)
    {
        data += "&" + escape(arrKey[i]) + "=" + escape(arrValue[i]);
		//data += "&" + arrKey[i] + "=" + arrValue[i];
    }
	//document.write(data);
    data = data.replace(/^&/g, "");
    this._post(data);
}

/*
 * Initialization for oAjax class
 */
oAjax.prototype.Init = function() {
    // initialization
}

/*
 * Change URL for request
 */
oAjax.prototype.SetUrl = function( url ) {
    this.Url = url;
}

/*
 * Set content type for HTTP header before sending request
 */
oAjax.prototype.SetContentType = function( type ) {
    this.ContentType = type;
}

oAjax.prototype.createXMLHttpRequest = function() {

    try { return new ActiveXObject("Msxml2.XMLHTTP");    } catch(e) {}
    try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch(e) {}
    try { return new XMLHttpRequest();                   } catch(e) {}
    return null;
}

/*
 * Debug information for testing
 */
oAjax.prototype._debug = function(message) {

    if ( this.Debug )
    {
        alert(message);
    }
}

/*
 * Process message and data from server
 */
oAjax._OnReadyStateChange = function( xreq, callback ){

    if ( xreq == null )
    {
        return;    }
    
    /*Status is completed, then process result */
    if ( xreq.readyState == 4)
    {
        // OK        
        if ( xreq.status == 200 )
        {
			//alert(xreq.responseText);
          	callback (this.ArrayValue(xreq.responseXML) );                     
        }else{
//	
		document.write (xreq.responseText);
		}
    } else {
        // Others
    }
}
oAjax.prototype.GetResponseTxt=function(HttpMethod,data)
{
    this._debug( 'Send Request ' + HttpMethod + data );
    
    if ( this.HttpRequest != null )
    {
        this.HttpRequest.open(HttpMethod, this.Url, false);

        if ( this.ContentType != null )
        {
            //  <FORM> MIME type: application/x-www-form-urlencoded
            this.HttpRequest.setRequestHeader("Content-Type", this.ContentType);
        }
        this.HttpRequest.send(data);
        return this.HttpRequest.responseText;
    }
    return null;
}
oAjax.prototype.GetResponseArray=function(HttpMethod,data)
{
    this._debug( 'Send Request ' + HttpMethod + data );
    
    if ( this.HttpRequest != null )
    {
        this.HttpRequest.open(HttpMethod, this.Url, false);

        if ( this.ContentType != null )
        {
            //  <FORM> MIME type: application/x-www-form-urlencoded
            this.HttpRequest.setRequestHeader("Content-Type", this.ContentType);
        }
        this.HttpRequest.send(data);
        var array = new Array();
        var i = 0;
        var response = this.HttpRequest.responseXML.getElementsByTagName('Response')[0];
	    var element = response.firstChild;
	    array[i] = element.firstChild.nodeValue;
	    while ( element = element.nextSibling )
	    {
		    i ++;
		    array[i] = element.firstChild.nodeValue;
		}
	    return array;
    }
    return null;
}
oAjax.prototype._SendRequest = function(HttpMethod, data){

    this._debug( 'Send Request ' + HttpMethod + data );
    
    if ( this.HttpRequest != null )
    {
        this.HttpRequest.open(HttpMethod, this.Url, this.yibu);

        if ( this.ContentType != null )
        {
            //  <FORM> MIME type: application/x-www-form-urlencoded
            this.HttpRequest.setRequestHeader("Content-Type", this.ContentType);
        }
        this.HttpRequest.send(data);
        return true;
    }
    return false;
}

/* Send GET request to server */
oAjax.prototype._get = function () {

    this._debug( 'GET' );
    return this._SendRequest("GET", null);
}

/* Send POST request and data to server */
oAjax.prototype._post = function (data) {

    this._debug( 'POST' );
    return this._SendRequest("POST", data);
}

oAjax.ArrayValue = function ( xmlobj ) {
    var array = new Array();
    var i = 0;
    var response = xmlobj.getElementsByTagName('Response')[0];
	var element = response.firstChild;
	array[i] = element.firstChild.nodeValue;
	while ( element = element.nextSibling )
	{
		i ++;
		array[i] = element.firstChild.nodeValue;
		}
	return array;
}