i remember reading something like this before, but when i searched i couldnt find it.
when i use setInterval at first it works, but slowly the the interval just starts to speed up. if you dont get what i mean heres the .fla
Remove this line from the randMove function [AS] var delayLength = math.floor(1000+math.random()*(2000-1000));[/AS]
Should work fine then. I think it is causing a confliction.
[edit]hehe, I just realized this reminds me of one of my own experiments 
http://www.kirupa.com/lab/randompoints.htm [/edit]
thx for the help, works wonders now, but yea i thought i had seen what i was trying to do before.