var _st = window.setTimeout; 
window.setTimeout = function(fRef, mDelay)  { 
	if(typeof fRef == 'function') { 
		var argu = Array.prototype.slice.call(arguments,2); 
		var f = (function(){ fRef.apply(null, argu); }); 
		return _st(f, mDelay); 
	} 
	return _st(fRef,mDelay); 
};


var XMLHttp = {
    _objPool: [],
    
    _getInstance: function ()
    {
        for (var i = 0; i < this._objPool.length; i ++)
        {
            if (this._objPool[i].readyState == 0 || this._objPool[i].readyState == 4)
            {
                return this._objPool[i];
            }
        }
        
        // IE5中不支持push方法
        this._objPool[this._objPool.length] = this._createObj();

        return this._objPool[this._objPool.length - 1];
    },

    _createObj: function ()
    {
        if (window.XMLHttpRequest)
        {
            var objXMLHttp = new XMLHttpRequest();

        }
        else
        {
            var MSXML = ['MSXML2.XMLHTTP.5.0', 'MSXML2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP', 'Microsoft.XMLHTTP'];
            for(var n = 0; n < MSXML.length; n ++)
            {
                try
                {
                    var objXMLHttp = new ActiveXObject(MSXML[n]);        
                    break;
                }
                catch(e)
                {
                }
            }
         }          
        
        // mozilla某些版本没有readyState属性
        if (objXMLHttp.readyState == null)
        {
            objXMLHttp.readyState = 0;

            objXMLHttp.addEventListener("load", function ()
                {
                    objXMLHttp.readyState = 4;
                    
                    if (typeof objXMLHttp.onreadystatechange == "function")
                    {

                        objXMLHttp.onreadystatechange();
                    }
                },  false);
        }

        return objXMLHttp;
    },
    
    // 发送请求(方法[post,get], 地址, 数据, 回调函数, 故障回调函数, 超时时间)
    sendReq: function (method, url, data, callback, callerrback, timeout)
    {
        var objXMLHttp = this._getInstance();
        with(objXMLHttp)
        {
            try
            {
                // 加随机数防止缓存
                var randstr = String((new Date()).getTime())+String(Math.random());
                if (url.indexOf("?") > 0)
                {
                    url += "&randnum=" + randstr;
                }
                else
                {
                    url += "?randnum=" + randstr;
                }
                
                
								
                open(method, url, true);
                
                // 设定请求编码方式
                setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
                send(null);
                
                myAbort = function( obj ){
                	obj.abort();
                	callerrback("TimeOut_ERROR");
                }
                var mytimmer = window.setTimeout(myAbort,timeout*1000,objXMLHttp);
                onreadystatechange = function ()
                {                   
                    if ( objXMLHttp.readyState == 4 )
                    {
                        try{
                        	clearTimeout(mytimmer);
                        }catch(e){}
                        if( objXMLHttp.status == 200 ){
                        	callback(objXMLHttp.responseBody);
                        }else{
                        	callerrback("Result_ERROR");
                        }
                    }
                }
            }
            catch(e)
            {
                callerrback("Deal_ERROR");
            }
        }
    }
};