Anyone know how to toggle images?

[onedrop]

greetings~

I need help with the following:

(example)

Say I have a picture of the human hands: If a user selects the left hand ring finger, I need it to highlight, then have the ability to submit to email form. (my email would state, "left hand, ring finger". If the user selects the left hand ring finger and right hand index finger, i need the email to say "left hand ring finger, right hand index finger)...

How do i get the images to toggle? I don't want these to simply be visited hyper links.

Thanks for your time.