Timer to Prevent Screensaver

I'm looking for a function that stands alone (not in a loop, etc.) and when a preset time elapses it moves the mouse to prevent the screensaver from coming on.

I don't think I can get TimerInit and TimerDiff to work but I am trying.

Basically I'm looking for something like this:
Start a Timer
When Timer elapsed time = 300 seconds call TimerElapsed() ;after 5 minutes call the function and repeat if necessary.
;
; Lots of code independent of Timer
.
.
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Func TimerElapsed
MouseMove (X.Y)
EndFunction