I have searched the forum but I can't seem to find an easy answer to this

The thing is, I do not want to load huge images in a gallery if the customer is viewing with a mobile or handheld, making the site slow and not a nice experience for those customers.
I could do 2 things: either make 2 galleries for all gallery pages (and I have 60+ galleries in this case) and somehow make an UDT to determine which gallery to show depending on the screen size.
Or I could fill all galleries with every image in 2 sizes and then use Rolf's great tutorial from cmscanbesimple (see http://www.cmscanbesimple.org/blog/gett ... -in-smarty to determine what images to show).
Anybody already experienced with this? Or any (other) ideas on this?

Isolde