System for keeping track of user favorites

[Rogerl]

On my website, I have a table \[code\]movies\[/code\] and a table \[code\]users\[/code\]I'm trying to have an "Add to favs" button that a user can click, which will add that movie to his favorites (ajax / javascript not necessary at the moment, just php).So what's the simplest way I could do something like that? I've thought about this but I can't seem to find a solution (all I think of is way too complicated, and in my opinion not possible).What's your thoughts?I don't need a ready-made script, just an idea that could get me working (although if you have an example of such script, I'd be happy to look at it).Thanks!