Thumbnails wont enlarge

Hi,
I’m having a problem enlarging thumbnails
I just installed a new theme and in demo version I saw, thumbnails enlarge normally
mine doesn’t seem to work
it just starts loading and nothing happens
maybe it’s the image folder problem?
I can’t view the image when I use the url

so here’s the demo version:

http://demo.billionstudio.com/

and here’s my site:

http://shop.twilight.ge/

p.s. I already searched if topic like this was opened, but none of them seemed to help me.
I hope I opened it in the right forum.

Thanks in advance,

Sani