如何在单独的框架中打开Ajax请求?

好的,我有这个代码:

 <script language="javascript" type="text/javascript">
<!--

function requestPage(page) {

    var request = false;

    try {
        request = new XMLHttpRequest();
    } catch (e) {
        try{
            request = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            try{
                request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {
            alert("Unable to complete your request.");
            return false;
            }
        }
    }

    request.onreadystatechange = function() {
        if(request.readyState == 4) {
            if(request.status == 200) {    
                document.getElementById('content').innerHTML = request.responseText;
            }
        }
    }

    request.open("GET", "include.php?page=" + page, true);
    request.send(null);
}

//-->
</script>

很明显,就是这样:

<a onclick="javascript:requestPage('red_the_clown')"><li>Red</li></a>
<div id="content"><?php include('index2.php'); ?></div>

我一直在努力解决如何瞄准一个单独的帧而不是当前帧的问题。也就是说,content div将在main中,但它是从一个帧调用的。

有人有什么想法吗?

事先谢谢!

赖安