[carpeperdiem]

I did it.
I remember it was a PITA, but very doable.

You will edit /common_files/product_thumbnail.tpl

I remember having to do a (3) ifs --

{if $main eq 'product'}
then the colorbox popup code

then another code block: {elseif $main eq 'cart'}

and yet a third else...

may not be the most elegant or efficient code, but it works.

I'm not your guy to do custom work -- but I hope this points you in a good direction.