Hi I just purchased Season 3's DVD. I was viewing it and I noitced in the episode "Like a Virgin" they show the shorter theme song. Is that the version that played when that episode was first aired? I'm guessing that it probally was. I have always wondered if they used to ocasionaly show the short version theme song, does anyone know?

Yes they do.
I got several full length episodes from the fifth season (australian airings), some have the short intro, some the long one.

O cool, I thought it was kinda weird, but my mom told me that the episodes that used the shorter intro , were probally longer episodes