//创建XMLHttpRequest对象
var request = false;
try {
	request = new XMLHttpRequest();
} catch (trymicrosoft) {
	try {
		request = new ActiveXObject("Msxml2.XMLHTTP");
	} catch (othermicrosoft) {
		try {
			request = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (failed) {
			request = false;
		}
	}
}
if (!request)alert("Error initializing XMLHttpRequest!");
//获取信息
function getHits(topicid) {
	var url = "../getHits.asp?topicid="+ topicid;
	request.open("GET", url, true);
	request.onreadystatechange = showHits;
	request.send(null);
}
//更新页面
function showHits() {
	if (request.readyState == 4) {
	if (request.status == 200) {
		var response = request.responseText;
		document.getElementById("topic_hits_div").innerText = response;
	}else if(request.status == 404) {
		alert ("Requested URL is not found.");
	} else if (request.status == 403) {
		alert("Access denied.");
	} else
		alert("status is " + request.status);
	}
}