screen saver for 2nd screen

hi, have 2 screens, if im playing a game on the main screen the second screen stays normal, i mean the screen saver doesnt come on, so i usually turn it on and off when i need it. is there anyway to get a screen saver for the slave screen only? it's my vista pc. i have ultramon which is great but there's no option for independant screen savers.
thanks

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