How to prevent screen from dimming/sleeping/etc when playing video?

When playing a video, how do you keep your monitor from dimming or sleeping, or turning the screen saver on in the middle of your video?
In Linux, using mplayer on X11, whenever a video would play, it would "disable DPMS" and the screen would stay on until the video was finished playing, just as if someone was in the middle of typing.
Is there a setting for this with the MacBook? I suppose it would have to be something global, meaning for QuickTime player, embedded WMV browser players, etc.
MacBook   Mac OS X (10.4.6)  

I only want to make changes for sleep and screen saver activation times for when I'm playing videos. I mean, if I'm watching an hour long video, I want to watch it without the screen changing 10 minutes into it.
However, I don't want to set my screen saver at 1 hour globally, as when I walk away from my text editor, it should sleep after 10 minutes or so.
Isn't there a way to set something so that the sleep/screen saver settings are disabled just when a video is being played?

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