[jQuery] AJAX GET from an higher directory. FF Yes IE No

[jQuery] AJAX GET from an higher directory. FF Yes IE No


I don't even know if this is possible but I'm looking to get a page in
an upper directory via an AJAX call. The following works in FireFox,
but Internet Explorer throws a "Permission Denied".
$(this).find('a').click(function(){
                    $.get("../ajaxtest-content.html", function(data){
                    alert("I am here and I exist");
                });
             });
Is there any rhyme or reason to this or is it just impossible to load
a file from a different directory in IE?