var http_request=false;

function send_request(url,objid)//初始化，指定处理函数，发送请求的函数
{
	http_request=false;
	//开始初始化XMLHttpRequest对象
	if(window.XMLHttpRequest)
	{//Mozilla浏览器
		http_request=new XMLHttpRequest();
	 	if(http_request.overrideMimeType)
		{//设置MIME类别
	   		http_request.overrideMimeType("text/xml");
	 	}
	}
	else if(window.ActiveXObject)
	{//IE浏览器
	 	try
		{
	  		http_request=new ActiveXObject("Msxml2.XMLHttp");
	 	}
		catch(e)
		{
	  		try
			{
	  			http_request=new ActiveXobject("Microsoft.XMLHttp");
	  		}
			catch(e)
			{}
	 	}
    }
	if(!http_request)
	{//异常，创建对象实例失败
	 	window.alert("创建XMLHttp对象失败！");
	 	return false;
	}

	var obj=document.getElementById(objid);
    http_request.open("GET",url,false);
	http_request.send(null);


	//http_request.onreadystatechange = function (){
	if(http_request.readyState==4)
   {//判断对象状态

		if(http_request.status==200)
		{//信息已成功返回，开始处理信息
			txt=http_request.responseText;
			obj.innerHTML=txt;
			//alert(txt);
		}
	}
	else
	{//页面不正常
		alert("您所请求的页面不正常！");
	}
//}
}