Invoice Data Entry - Pop Up/Alert??

SOLVED

is it possible to have a pop up (memo or note) happen when you go into invoice entry and either create an invoice from a sales order or when you create an invoice on demand driven off of the customer number?

what we are trying to do is create an alert to the user when creating an invoice for a certain customer that there can be potential freight charges needed for that customer , something like this happens when creating a sales order, so wondering if it could happen during invoice entry time.