photos in gallery of last 30 days free, archives paid.

[globalinsites]

Hello,

Here's what I want to do with my site that has vbportal,vbulletin and photopost eventually:

I want the photos in my photopost gallery of the last 30 days to be visible for free for registered users and registered users who want to access 'the archives' would have to pay. Now I know how to deal with payprocessors and all, but I don't know how to deal with setting this up technically. I mean, I can give or not give users access by editing the usergroups settings, but how can I make a usergroup that can access the photos of the last 30 days and a usergroup that can access all photos? Would that require hacking?

Rik.