Webuser Forums: On-line email form

I am currently working on a website for a local non-profit group and would like to include an on-line email form to keep email address private to avoid them being caught by spammers. I also want to submit the email via the webserver rather than by launching the visitor's default email program. The form I want is like the one below, but as this submits the email using an email program this is no good.

http://www.javafile.com/forms/picaddress.php

Does anyone have the know-how to write such a script for me, or can anyone point me in the right direction to get a free script? There needs to be choice of 5 contacts available and the script needs to be easily changed as members come and go. Have already spent hours on-line looking for a script

Thank you.

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