function StringBuilder()
{
    this._content = new Array();
    if( typeof StringBuilder._init  == "undefined" )
    {
        StringBuilder.prototype.Append  = function(str)
        {
            this._content.push( str );
        };
        StringBuilder.prototype.ToString = function()
        {
            return this._content.join("");
        };
        StringBuilder.prototype.Clear=function()
        {
        	this._content.length=0;
        	return this._content;
        };
        StringBuilder._init = true;
    };
};
function Ajax()
{
    this._xmlHttp = (function()
                    {
                        try
                        {
                            if( window.ActiveXObject )
                            {
                                var arrSignature = ["MSXML2.XMLHTTP.5.0","MSXML2.XMLHTTP.4.0","MSXML2.XMLHTTP.3.0",
                                                    "MSXML2.XMLHTTP.2.0","Microsoft.XMLHTTP"];
                                for( var i = 0; i < arrSignature.length; i++ )
                                {
                                    try{
                                            return  new ActiveXObject(arrSignature[i]);
                                       }
                                    catch( exception )
                                    {
                                    };
                                };
                            }
                            else
                            {
                                return new XMLHttpRequest();
                            };
                        }
                        catch(exception)
                        {
                            throw new Error("您的浏览器不支持ajax");
                        };
                    })();
     this._params = new StringBuilder();
     if( typeof Ajax._init == "undefined")
     {
        Ajax.prototype.Get = function(url, oFunction)
        {
            var oXMLHttp = this._xmlHttp;
            
            this._xmlHttp.open("GET",url+this.GetParams(),true);
           
            this._xmlHttp.onreadystatechange = function()
                                                        { 
                                                       			
                                                            if( oXMLHttp.readyState == 4  && oXMLHttp.status == 200)
                                                            {
                                                                
                                                                if(typeof oFunction == 'function')
                                                                {
                                                                    oFunction(oXMLHttp.responseText,oXMLHttp.responseXml);
                                                                    };
                                                                };
                                                        };
            this._xmlHttp.setRequestHeader("Cache-Control","no-cache"); 
            this._xmlHttp.send(null);
        };        
        Ajax.prototype.Post = function(url, oFunction)
        {
            var oXMLHttp = this._xmlHttp;
            this._xmlHttp.open("POST",url,true);
            this._xmlHttp.onreadystatechange = function()
                                                        {                                                     
                                                            if(oXMLHttp.readyState==4  && oXMLHttp.status==200)
                                                            {
                                                                if(typeof oFunction == 'function')
                                                                {
                                                                    oFunction(oXMLHttp.responseText,oXMLHttp.responseXml);
                                                                    };
                                                                };
                                                        };
            this._xmlHttp.setRequestHeader("Cache-Control","no-cache");                                             
            this._xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
            this._xmlHttp.send(this.GetParams().substring(1));
            
        };
        Ajax.prototype.AddParams = function( name, value )
        {   if( this._params.ToString().indexOf("?")== -1 )
            {
                this._params.Append("?");
            }
            else
            {
                this._params.Append("&");
            };
            this._params.Append( encodeURIComponent(name) );
            this._params.Append( "=" );
            this._params.Append( encodeURIComponent(value));
        };
        Ajax.prototype.RemoveAllParams = function()
        {   
        	this._params.Clear();
        };
        Ajax.prototype.GetParams = function()
        {
            return this._params.ToString() +"&rand="+ Math.random();
        };
        Ajax.prototype.Dispose = function()
        {
            this._params=null;
            this._xmlHttp=null;
            this._init=null;
        };
        Ajax._init = true;
     };
};

function creatAjax()
{
    try
    {
        if( window.ActiveXObject )
        {
            var arrSignature = ["MSXML2.XMLHTTP.5.0","MSXML2.XMLHTTP.4.0","MSXML2.XMLHTTP.3.0",
                                "MSXML2.XMLHTTP.2.0","Microsoft.XMLHTTP"];
            for( var i = 0; i < arrSignature.length; i++ )
            {
                try{
                        return  new ActiveXObject(arrSignature[i]);
                   }
                catch( exception )
                {
                    throw new Error("您的浏览器不支持ajax!");
                };
            };
        }
        else
        {
            return new XMLHttpRequest();
        };
    }
    catch(exception)
    {
        throw new Error("您的浏览器不支持ajax");
    };
};