Bulletproof - Localhost

HI
I hope someone is able to work this problem out for me. Have installed the Morfeoshow 1.2.0 on a site. But when using IE 8.0 - and sometimes Firefox 3.5.3 - I get this error on the gallery-categories-pages. When I click on a thumbnail, I get the black background image. But no image are shown.

In the bottom of IE 8 I can read that there was an error on the page. The details states, that there are an invalid argument somewhere... It looks like this:
Detaljer om fejl på websiden

Brugeragent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)
Tidsstempling: Mon, 26 Oct 2009 11:58:55 UTC


Meddelelse: Ugyldigt argument.
Linje: 136
Tegn: 21
Kode: 0
URI: http://www.caetano.info/components/com_ ... ox-base.js


Meddelelse: Ugyldigt argument.
Linje: 136
Tegn: 21
Kode: 0
URI: http://www.caetano.info/components/com_ ... ox-base.js

Anyone got a clue on how to fix it? It's rather urgent as the owner has to go public with the page today or tomorrow

Yours
Claus