Use of globals in UDFs are evil and almost always unnecessary. Values should be passed by parms and returned by the function.
Code:
break on
$Count = 1

for $X = 1 to 10
 $Count = Increase($Count)
 $Count ?
next
?
for $X = 1 to 10
 $Count = Decrease($Count)
 $Count ?
next

Function Increase($count)
 $count = $count+1
 $Increase = $count
EndFunction

Function Decrease($count)
 $count = $count-1
 $Decrease = $count
EndFunction
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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.