Hmm... I just checked the link in my sig and it does mention fractions of a second.
quote:
SLEEP

Action
Halts script execution for the number of seconds specified. Note that you can specify fractions of a second.

Syntax
SLEEP

Examples
SLEEP 10 ; pause script for 10 seconds

SLEEP 0.5 ; pause script for half a second


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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.