The how to use is given on that link, did you try it?
There is a tutorial for something like this already on the support forum - http://help.forumotion.com/t113681-add-a-lightbox-effect-to-the-images-of-the-forum .
but then the frame around the images doesn't come, if i use the other code?
Do you mean the white frame? I get it on my forum. If the image has a white background, you will not see the white frame around it.
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