external monitor, how to stop mac from going to sleep?

[maeglutz]

i've been hooking my macbook up to my hdtv to watch hulu, movies etc (using mirroring), but i can never snap my macbook shut or it goes to sleep.

how do i stop that aside from plugging in an external keboard?

 

[GfulDedFan]

InsomniaX - 1.3.2

 

[maeglutz]

InsomniaX - 1.3.2

thanks. weird that there is no built in option in system preferences

 

[Dr. Spock]

Caffeine

Caffeine from lightheadsw.com

very very simple to use.