[QUES] Change the URL for the logo of PGTheme?

I realize this is probably a really stupid question,
but i've been trying to figure this out all day, searching the forums, etc, and I give up.

I'm trying to change the URL for the main logo on the PGTheme (the one that defaults to "PedroGilberto") -
instead of the logo linking back to main gallery,
i'd like to make it link to the main homepage of my website.

EXAMPLE - right now the logo links to:
www.website.com/gallery2/main.php

I want to change it so that
the logo links to: www.website.com

is that possible? it seems easy enough, right?
i just don't enough about modifying the theme.tpl -

if anyone can tell me what i need to do change the URL so that the logo I would really appreciate it!

Thanks!
steve