[jQuery] .ajax GET not working correctly at webhost

[Nahaz]

I have this snippet:

function ajaxAdd() {
        $('form').submit(function() {
                                   var nick = document.register.nick.value;
                                   $(':submit', this).attr('value', 
'Adding...');
                                   $(':submit', this).attr('disabled', 
'disabled');
                                   $.ajax({
                                                  type: 'GET',
                                                  url: 'data.php',
                                                  data: 'nick=' + nick,
                                                  success: function() {
                                                          $(':submit', 
this).removeAttr('disabled');
                                                          
$('#status').load('output.php');
                                                          }
                                                  });
                                        });
}

that is sent when a very simple form (one value and button) is sent.
The thing is, it works on my local webserver, but when I upload it to
my webhost, it wont work. It works if add data.php?nick=Test, then the
data will be added into my database but not when called from .ajax.