iMac - sleep main monitor w/ dual monitors?

I have an iMac which is also connected to my TV for watching movies, etc.

Is there a way to sleep the main monitor on the iMac when watching something on the TV?

System:
- early 2006 iMac 20"
- ATI Radeon x1600
- OS 10.6.2

Thanks.

I posted this in the hardware section, but no responses and the question is in the gray area between hardware and software...

Original post

I have an iMac which is also connected to my TV for watching movies, etc.

Is there a way to sleep the main monitor on the iMac when watching something on the TV?

System:
- early 2006 iMac 20"
- ATI Radeon x1600
- OS 10.6.2

Thanks.

Still better to bump the original thread than to crosspost.

Now without a separate keyboard/mouse - close the lid, let it go to sleep, then wake it up.

Or do what I do, just dim the display all the way down.

Will merge this with the original.

Sorry - didn't realize how to move the post.

Just one more question. Where do I find the lid on my iMac?