[Tien Theme] Add hyperlink to header image?

Hey there guys...

I just created a gallery using the newest release and have chosen the Tien Theme.

Site: http://www.610Photos.com

My question is, how can add a hyperlink to the main header image?

I'd like to have it hyperlinked back to "main.php" so that no matter what album (or page) your on you can quickly click the header image to take you back to the main page.

Any help is greatly appreciated!!!