HELP! Validation of the contact form

Hi guys, i need help badly. :toad:
Anyone can help me with the validation of the contact form in this tutorial…

example: when someone didn’t type in their First Name, there will be a pop up message asking them to fill in all the details before they can proceed.

http://www.kirupa.com/developer/actionscript/forms_database.htm

thanks :hugegrin: