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

[Pete]

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?