Hey guys,

Ajax and jQuery is something I'm new to, but PHP, Javascript, and MySQL I'm pretty well seasoned with.

For starters, I want to create a simple form where there are these fields:

Name (text field)
E-mail (text field)
Zip Code (text field)
Cell Phone Number (text field)
Phone Carrier (dropdown menu)

Thing is, I want to check the database to see if an e-mail address has already been entered. I'd like for that to happen after they enter the email address and tab or click out of the e-mail text field.

For instance, after they enter an e-mail address and tab to the Zip Code field, the script queries the database to see if that e-mail exists already. If it does, it notifies the user and greys out the submit button. If not, they're allowed to finish filling the form out and submit. It'll be a huge time saver if this Ajax script is in place.

I don't expect someone here to create the script, but I would appreciate if someone could point me to a book or tutorial on how to put this into place.

Thanks a ton!