Unfortunately it is a holiday Monday for the WA people, but they will be in tomorrow.
I have been going over your page and can get it to work OK from this end, by re-applying the original Contact Form captcha code and re-adding spry via Dreamweaver.
To test this at your end, could you substitute the attached file for your 'involve_join_2010.php' page and see what results you get.
You will need to make sure that ALL of the Contact Form Solution Pack files have been uploaded 'as is' (apart from the Contactus.php, Contact_styled.php and the help file). You will also need to keep the adjusted WA_Globals.php with your details.
Hopefully this will take you forward a bit. Please post back with your results.
Edit// - This is the test page Feel free to send with filled in and blank fields and correct/incorrect captcha text to test. The form currently doesn't go anywhere.