Screen lock with password

[iamamac]

Hi guys,
I have an iMac 20'' running Snow Leopard and I want to keep my screen on (to be more specifically, I need to keep it on with a photo on it, always) but when someone moves the mouse or press a key I don't want them to access my computer without entering my password. (like a transparent screen lock app)
I think you got the idea, can you recommend me a software that does this? Thanks!

 

[r.j.s]

Single-photo screensaver with password requirement.

 

[peetah]

Have you ever thought of maybe going to System Preferences

Go to Desktop & Screen Saver
Choose the picture you want to display

Then maybe going to Security and clicking on Require password immediately after screen saver begins?

This ain't Winders where you need to pay for crap software that's already built in. So think outside of the Winders box.

 

[iamamac]

Have you ever thought of maybe going to System Preferences

Go to Desktop & Screen Saver
Choose the picture you want to display

Then maybe going to Security and clicking on Require password immediately after screen saver begins?

This ain't Winders where you need to pay for crap software that's already built in. So think outside of the Winders box.

Thanks! That's perfect!
I'm not that new to mac and I hate Windows, I just didn't know how to do it!
Anyway, this is the proof that os 10 has all the stuff you need already in it, you just need to figure out where!
Thank you again!

P.S.: Also, you could change the login image, it's pretty much the same thing.