Problem using the Locking popup tweak

[srdjan]

Hi
I am still struggling with locked popups tweak.
I've tried every suggestion mentioned here but I still can't make it to work.
What I have is gallery of images and I want to switch them when user click on their thumbnails.
I am sending you example with two thumbnails only. Can you,please, check what I am doing wrong?

Thanks in andvance