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XMLHttpRequest with password authentication?

Has anyone used XMLHttpRequest on a web page requiring password authentication? I can't get it to work. Would someone look over my code and see if I'm doing something obviously wrong?

I have a Linksys router that I'm trying to pull information from to display in a widget. I started with Apple's Blank Widget, adding code to request a web page. It works fine with a normal (no password required). Running it in Dashboard does not work on the linksys page, even when sending the password in the XMLHttpRequest.open function. But when I open the .html file in Safari, it pops open a username/password box. I enter the password and it displays correctly.

My BlankWidget.js is:
-----
function setup()
{
    //target = "http://www.slashdot.org";;
    target = "http://192.168.1.1/WL_ActiveTable.asp";;
    loadXMLDoc(target);
    return 0;
}
function loadXMLDoc(url) {
    debug(url);
    xmlRequest = new XMLHttpRequest();
    xmlRequest.setRequestHeader("Cache-Control", "no-cache");

    xmlRequest.onreadystatechange = processReqChange;

    //xmlRequest.open("GET", url, true);
    xmlRequest.open("GET", url, true, "", "linksys");
    xmlRequest.send(null);
}

function processReqChange() {
    if (null == xmlRequest.readyState) {
        debug('readyState is null');
        return;
    }

    if (4 != xmlRequest.readyState) {
        debug('readyState is ' + xmlRequest.readyState);
        debug(xmlRequest.status);
        return;
    }

    debug('readyState is ' + xmlRequest.readyState);
    debug(xmlRequest.status);
}
-----

Debug output:
--> http://www.slashdot.org // normal, no password page - works correctly
--> readyState is 1
--> undefined
--> readyState is 2
--> 200
--> readyState is 3
--> 200
--> readyState is 4
--> 200

--> http://192.168.1.1/WL_ActiveTable.asp        // in Dashboard
--> readyState is 1
--> undefined

--> http://192.168.1.1/WL_ActiveTable.asp // in Safari
--> readyState is 1
--> undefined // the Safari username/password popup happens here
--> readyState is 2
--> 200
--> readyState is 3
--> 200
--> readyState is 4
--> 200
----

So it seems that adding a username/password to XMLHttpRequest.open does absolutely nothing. The linksys only uses the password, and ignores a username. Even changing the username above from "" to "ignoreme" has no effect.

Suggestions?

Thanks,

Danny


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