Thumbnail Click Problem

Hallo,

I have a litle Problem with my Pictures that i have on Gallery2.
Heres the Homepage with Gallery2:
http://www.altenheim-gruenburg.at/gallery2/main.php?g2_itemId=13

If i click on image called "Winter" then it opens but the backgroundtheme is affected.
This doesnt look very nice, is there a possibility to open an image from an java applet like the diashow you see in this link?
http://www.altenheim-gruenburg.at/gallery2/main.php?g2_view=slideshow.Slideshow&g2_itemId=13

I would like this, by all images. If i click on Image then it should open in Slideshow instead of normal browser view.

Thank you very much!