[jQuery] Problem with Cluetip and Link to delete

[psy*]

Hello,
I have the following code:

JS:
$(document).ready(function() {
   $('a.help').cluetip({
        cluetipClass: 'jtip',
        arrows: true,
        dropShadow: false,
        leftOffset: 20,
        fx: {
          open:       'fadeIn',
          openSpeed:  ''
        },
        local: true,
        hideLocal: true,
   });
});

HTML:
<a class="help" rel="#loadme1" href="?cmd=delete_beitrag&bid=150"
onclick="return confirm('Diesen Beitrag wirklich löschen?');"><img
src="img/delete.gif" border="0" /></a>
[...]
<p style="display: none" id="loadme1">Löschen|Diesen Bereich löschen</p>


If I click the link, a message prompt comes up and if I click "abort",
the link is executed anyway even though it should not be executed ;)

What's the problem?

Thanks!