I've applied the thumbnail to full-size pop-up mod by GauGau: http://forum.coppermine-gallery.net/index.php?topic=34360.0 to a gallery I was paid by someone to make.
Now the person I made the gallery for wants the full sized picture to resize to the screen size of the user, which is really a browser feature, and would have been easy to do if I had done a static site, with just <a href target="_blank"...>
My guess is that the code:
// '{LINK_TGT}' => "displayimage.php?album=$aid$cat_link&pos={$thumb['pos']}$uid_link", // commented out for the mod 'from thumbnail to pop-up'
'{LINK_TGT}' => "javascript:;\" onClick=\"MM_openBrWindow('displayimage.php?pid={$thumb['pid']}&fullsize=1','" . uniqid(rand()) . "','scrollbars=yes,toolbar=yes,status=yes,resizable=yes,width={$thumb['pwidth']},height={$thumb['pheight']}')",
needs some changing, but I'm not familiar enough with javascript and php to know what to do.
I can't post a budget because I'm not the end user who pays the bill. If anyone feels confident of having a solution just give me a price offer via PM, and I'll forward the price offer to my client. My guess is that he'll accept something in the $50~$100 range but I can't vouch for him.
The view counter is also currently not working as it depends on the intermediate sized picture page: http://forum.coppermine-gallery.net/index.php?topic=34360.msg208843#msg208843. My client is also looking for a fix there. Again I'd forward your prices to him to see if he accepts. This seems like a larger problem to fix so my guess is something in the $150~$250 range, but again, I stress that I'd have to forward a price quote to him to see if he accepts.
In both cases don't hesitate to make a quote if the ranges I put are too low - I'll forward the price quote to my client and there's always a chance he might accept your offer.