请问如何在firefox中创建xmlhttp对象？？？

[islong]

我在ie里用microsoft.xmlhttp，但这样的对象名在firefox里创建不了，请问怎样才可以创建一个在ie和firefox里都通用的xmlhttp对象，而不需要在服务端或客户端装什么组件？

[孟子E章]

<script type="text/javascript">

var isIE = false;
var req;
loadXMLDoc("http://dotnet.aspx.cc/Rss.aspx")
function loadXMLDoc(url) {
if (window.XMLHttpRequest) {
req = new XMLHttpRequest();
req.onreadystatechange = processReqChange;
req.open("GET", url, true);
req.send(null);
} else if (window.ActiveXObject) {
isIE = true;
req = new ActiveXObject("Microsoft.XMLHTTP");
if (req) {
req.onreadystatechange = processReqChange;
req.open("GET", url, true);
req.send();
}
}
}

function processReqChange() {
if (req.readyState == 4) {
if (req.status == 200) {
alert(req.responseXML.xml)
} else {
alert("错误:\n" + req.statusText);
}
}
}
</SCRIPT>

[孟子E章]

参照
http://developer.apple.com/internet/webcontent/XMLHttpRequestExample/example.html