求助:如何实现下面的样子啊,/

/*
++ Ajax基础类，返回服务器端的原始数据
++ Date                        : 2008-01-03
++ Author                      : Rong
++ @param string url           : 远程调用路径  
++ @param string pars          : 附加到路径的url参数  
++ @param string method        : 请求方式，get或post  
++ @param object obj           : 此对象为数据请求成功后数据存放的容器  
++ @param boolean asynchronous : 是否异步调用,true和false
*/
function Ajax(url,pars,method,obj,asynchronous)  
{
         var xmlHttp;  
         if(window.ActiveXObject)  
            {  
                try  
                {  
                    xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");  
                }  
                catch(e)  
                {  
                    xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");  
                }  
            }
            else if(window.XMLHttpRequest)  
            {  
                xmlHttp = new XMLHttpRequest();  
            }   
         
            if(method.toLowerCase() == "get")  
            {  
                url = url+"?"+pars;  
                xmlHttp.open("GET",url,asynchronous);  
                xmlHttp.send(null);  
            }  
            else  
            {  
                xmlHttp.open("POST",url,asynchronous);
                xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");  
                xmlHttp.send(pars);  
            }

            xmlHttp.onreadystatechange = function()  
            {  
                if(xmlHttp.readyState == 4 && xmlHttp.status == 200)  
                {   
                   obj.innerHTML = xmlHttp.responseText;
                }  
            }
}