Anyone know where I can find info on creating user defined
excel fuctions?

Just as a rudimentary example:
---------------------
Public Function Test(ByVal dAmt As Double) As Double

Test = dAmt * 2

End Function
------------------
This returns the "#VALUE!" error message. Never done an
excel UDF, so I've no idea what I'm doing wrong (or even
right).

Thanks in advance,

Sean