Using add-to-cart-button cause appearing my whole site in mainframe

[stevenp]

Hello
Many thanks to stramm, he helps me a lot. If i use the addtocart-button, my whole side-content appears in my (mainframe).
http://www.bike-bilder.de/cpg/thumbnails.php?album=5
What's wrong? Where or what must be changed?
Steven

[Stramm]

that's due to joomla (wrapper or whatever it's called). As said I'm not familiar with joomla

[stevenp]

Strange,
buying as admin works. But as registerd user it doesn't. I made a testaccount:
user: stevenp
password: 123456
http://www.bike-bilder.de
I think, the config is okay but what's the problem.
Still like this, my shop is a flop.
steven