few questions.

1. if i have 20 form fields and im passing them along throught he .js file do i need to put each var in the .js file or just the ones im checking for errors or that are required?

or do I place every var that will be sent to the php file so the php file can then handle the information and send the email?

2. where is a good place to look on how to code error checking... for instance email. or phone.. etc.