In Facebook app, is there a way to link directly to "join a group"

Question

I'd like to have a link for a user to join a Facebook group from within my Facebook application.

Here is the link on Facebook's "display a group" page (minus a longer referrer part), but the group id is encrypted:

http://www.new.facebook.com/group.php?sid=c431b3cfc02765def331081f8b71ffbd

Anyone know how to either encrypt a group id the Facebook way or otherwise build a link that adds a user to a group?

Thanks!

Answer 1

Can you not just use the group id?

This works for me: http://www.new.facebook.com/group.php?gid={ID}