[jQuery] jQuery Ajax breaking in IE..... please help!!

[yrelkin]

I am developing a VoIP Customer Portal with jQuery/Ajax.
Everything works fine in Firefox, but in IE and Safari, the JS breaks.

I used MS Script Debugger to get a backtrace, and i find that the
breakpoint is at a jQuery Ajax call:

var AJAXURL = 'app/ajax.php';
$.ajax({
                                   url:AJAXURL+"auth-login",
                                   type:"POST",
                                   data:"user="+uname+"&pass="+pass,
                                   dataType:"json",
                                   success:function( json ) {
                                            // code removed
                                   }
                                   });

Why oh why is this happening??

Any help would be greatly appeciated.