var http_request = null;
    
    function CreateHttpRequest()
    {
      if(window.XMLHttpRequest)
        {
            http_request = new XMLHttpRequest();
        }
        else if(window.ActiveXObject)
        {
            http_request = new ActiveXObject("Microsoft.XMLHTTP");
        }
        if(!http_request)
        {
            window.alert("创建实例失败...");
            return false;
        }
    }
    
    //queryString:参数 Url:目标文件,Message:成功后的提示,ReUrl:成功后将要更新的页面
    function send_request(queryString,Url,Message,ReUrl)
    {
      //http_request = null;
      CreateHttpRequest();
        http_request.onreadystatechange = function()
        {
			if(http_request.readyState == 4)
			{
				if(http_request.status == 200)
				{
					//alert(http_request.responseText);
					//alert(Message);
					//if(http_request!=null)
				//	{
				//	http_request = null;
				//	}

					
				}
				else
				{
					alert("请求的页面异常");
				}
			}
        }
        http_request.open("POST",Url,true);       
        http_request.setRequestHeader("Content-Type","application/x-www-form-urlencoded;charset=GB2312");
        http_request.send(queryString);
    }
    
   
   ///提交数据并返回
 function SendAndReturn_Request(queryString,Url,ShowObjID)
    {
   
      //http_request = null;
      CreateHttpRequest();
        http_request.onreadystatechange = function()
        {
			if(http_request.readyState == 4)
			{
				if(http_request.status == 200)
				{
					
				
				
				var obj = document.getElementById(ShowObjID);
				
				obj.innerHTML = http_request.responseText;
					
				}
				else
				{
					alert("请求的页面异常");
				}
			}
        }
        http_request.open("POST",Url,true);       
        http_request.setRequestHeader("Content-Type","application/x-www-form-urlencoded;charset=GB2312");
        http_request.send(queryString);
    }
    
    ///返回
    function get_request(Url,ShowObjID)
    {
    http_request = null;
        CreateHttpRequest();
        
        http_request.onreadystatechange = function()
        {
			if(http_request.readyState == 4)
			{
				if(http_request.status == 200)
				{
					
					var obj = document.getElementById(ShowObjID);
					obj.innerHTML = http_request.responseText;
					
				}
				else
				{
					alert("请求的页面异常");
				}
			}
        }
        http_request.open("get",Url,true);            
        http_request.send(null);
    }