ajax让返回的内容显示在特定div里

/* 以下代码通过ajax实现在一个web页面点击不同的链接，然后将返回的结果显示在该页面固定的div里。 */

<html>
<head>
<Meta charset="UTF-8">
<title>Insert title here</title>
<script language="javascript">
var HTTP_Request = false;
function createRequest(url,objID){
	HTTP_Request = false;
	if(window.XMLHttpRequest){ //非IE浏览器
		HTTP_Request = new XMLHttpRequest();
		if(HTTP_Request.overrideMimeType){
			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){
		alert("无法创建XMLHTTP实例");
		return false;
	}
	HTTP_Request.open("GET",url,true);
	HTTP_Request.send(null);

	var obj = document.getElementById(objID);
	HTTP_Request.onreadystatechange = function(){
		if(HTTP_Request.readyState == 4){
			if(HTTP_Request.status == 200){
				obj.innerHTML = HTTP_Request.responseText;
			}else{
				alert('您请求的页面发现错误！');
			}
		}
	}
}
</script>
</head>

<body onload="createRequest('content1.html','show')">
<div align="center">
	<a href="content1.html" onclick="createRequest('content1.html','show');return false;">no1</a> |
	<a href="content2.html" onclick="createRequest('content2.html','show');return false;">no2</a> |
	<a href="content3.html" onclick="createRequest('content3.html','show');return false;">no3</a>
</div>
<div id="show" align="center"></div>
</body>
</html>

ajax让返回的内容显示在特定div里

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