Use of vbscript input box function with mas 200

I'm doing a button script to prompt for a value and then execute some code. Trying to avoid creating a udf to hold the parameter that will just be discarded after the code is run.

Succeeded in mas 90 using the following:

Retval = inputbox("enter value",,0)

However in mas 200 you get ole error number 70. Permission denied 'inputbox'

Sounds similar to issues of msgbox and message box. Anyone know how to get around this?