Would there be a way to modify coppermine to parse all displayimage.php links to something like this:
<a href=otherscript.php?url=displayimage.php?album={album}&cat={cat}&pos={pos}>
?
I have no idea what you're talking about. Are you suggesting a redirection? If yes, just add the redirector at the top of displayimage.php.
Can't see how this is suppossed to be a custom link...