Computer sleeps during Quicktime playback

When I watch video, my computer goes to sleep after the time I have alloted in my power management settings. This does not happen in VLC or Mplayer. I know that I am not moving my mouse but I am "doing something". This is on my Macmini PPC G4 and I have all the latest system and software installed.
thanks
1.83ghz macbook (mine) ibook 1.2ghz (wife) mac mini 1.42 (mp3 iphoto server) Mac OS X (10.3.9)

Hi, I can help a bit...
cmd+F will put the movie into fullscreen. If I leave my quicktime out of fullscreen mode, the screen saver will come on, but fullscreen fixes this.
If you're watching a low quality movie, you can open up Preferences (not the one that says, "Quicktime Preferences," press cmd+,) click the "Fullscreen" tab and change to desired size.
If all else fails, you can turn off sleeping entirely, or tape down a keyboard button or something
hope this helped
peace

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