[jQuery] xml webservice & callback & document.domain

[Scott Vickers]

I am trying to call a .net webservice with a get and no parameters.
It is returning a simple xml doc with a single string element like
this:
<?xml version="1.0" encoding="utf-8"?>
<string xmlns="http://www.mysite.com/";>
blahblah
</string>
</xml>

here is the jquery code I am using:
$.ajax({
            type:"GET",
            dataType: "xml",
            url:$link.attr('href'),
            contentType: "application/x-www-form-urlencoded",
            data: {useSsl:useSsl},
            success: function(data){
                    var res = $('string',data).text();
                    $('#' + dest).html(res);
                },
            error: function(data){
                    ShowErrorMessage(dest);
                }
         });
This works great in all browsers EXCEPT on pages where
document.domain="mysite.com"; is set.  It seems if the datatype is set
to xml on the pages in question the success callback is never fired in
firefox, no js errors show up in firebug either and IE works as
expected.
If I change the datatype to text and then in the callback make it:
var res=$(data).text(); it works wonderful in firefox, but only comes
up with a blank string in IE doh!
any suggestion on how to make it work?  we currently require the
document.domain setting because of iframing some 3rd party content.
any help is appreciated, this is driving me crazy.