It works fine, try this:
 Code:
For Each $RESULT in Split("-1 0 1")
	$RESULT=CInt($RESULT)
	If $RESULT=0 OR $RESULT=(-1)
		$=MessageBox("In THEN when RESULT="+$RESULT,"Box",4160)
	Else
		$=MessageBox("In ELSE when RESULT="+$RESULT,"Box",4160)
	EndIf
Next