Help with conditional statement.. i think?!?

Hey Guys,

I am not a programmer, so have no idea how to set this up. Any help would be appreciated.

Take a look at the link before you read on.
http://www.ednacional.com/port/SBliss.html

Basically there are 3 photos, 2 set to 0% alpha and 1 set to 100% and each have a mini page icon which changes the photo that is visible. i when the side bar opens i want it to find out which photo is visible and have the appropriate icon on rollover state (grow) so you always know which of the photos are visible.

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Thanks for any help or suggestions!