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I have the functions.ahk and it was open when I ran the script.
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It should not be open, just saved in the same folder as original script.
Chances are from the error you posted above you don't have the most recent version of Roland's Functions... re-download from here:
http://www.overcards.com/wiki/moin.cgi/RolandsFunctions
try again, post results [img]/images/graemlins/smile.gif[/img]
Best of luck,
dave.