Pop-up of full image doesn't appear

Dear Support,
I installed Sige in my website, and all worked well.
I can't understand why without any changing from admin panel the pop-up windows don't appear any more...please, may you take a look to this page?
www.caterinacirri.it/portfolio/disegni.html

I attach also the settings of the sige gallery...www.caterinacirri.it/admin_sige.jpg

The only changing I've done is the inserting of the script of Google Analytics within head tags.
Thanks a lot for your kind answer.

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