Browser Issue FF

Hi,
at first I want to say many thanx for this excellent slider you coded.
I have an issue with FF.
FF does not show the slider on page loading. Somtimes FF shows the slider after several refreshs, but with black gaps between the images.
Chrome and Opera are fine concearing this issue. (and I tried FF without addons also)
If I disable Load JQuery the slider completely disapears. What can I do here?

But I have also the problem that I have to enlage the Width of the slider (+100px lagrer than the images)to have the picture in the center of the modul position. But now the navi buttons are out of the module...

www.jeb-ev.de/

Hi
line 227 in the file
www.jeb-ev.de/templates/jp_medium_j2.5/css/template.css
delete the "text-align:right;" on #mainmenu

Ced