create keyboard shortcut to start screensaver on 10.5.8

i'd like to have my screensaver start when i press a key.... say f5 or f6

what's the simplest way to achieve this?

thanks.

I wouldn't bother assigning a shortcut for it as you can use a hot corner.

System preferences, desktop & screensaver, screensaver, hot corners, and pick a corner.
Then you drag your mouse to that corner, and voila

thanks for the reply 6string.

i'm aware of the hot mouse corners.... but if possible i'd like to set a keyboard key to activate it.

ok, then you may want to have a look at this:
Quickly lock your screen | Software | Mac OS X Hints | Macworld