Problem displaying gallery mobile devices

[mnikolai]

I don't know if it a portfolio.js but to fix it I have to start somewhere:
On my web site I am using portfolio in a iframe because I need the gallery always centered,
This is working perfect on a pc but not when accessing the site with an i.e. iphone. Here it is not possible to scroll the gallery to the right.
When open the gallery directly without iframe it is working properly.
Example:
http://olafrayermann.de/ads_campaigns.html klick on any picture: Not working on iphone
http://olafrayermann.de/gallery1.html: is working.
Is it my approach? Any known problem in portfolio.js?
Regards,
Michael