Screen dims when watching internet movies

My PBg4 screen becomes dim when watching internet videos or slide shows in iphoto or imovie.
I have to keep moving the mouse to keep the screen well lit.
Is there a way to fix this problem and still have the dim screen dim in all other situations where needed?

Thank you so much.
I did not want to set the CP to never sleep, because in normal circumstances I want the screen to dim.
This way I can activate the non-sleep feature only when I need to.
Regards

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