Almost any of the Ajax frameworks could make it easy to do interactive validation of that form. You would just be adding client-side JavaScript event handlers.
Obviously, it's not so difficult as you thought.
Just, add some javascript to your webpage directly. I mean AJAX doesn't conflict with your old PHP source.
You can refer some examples here.
http://www.becoding.com/source/php+ajax/
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How can i convert PHP-Contact form to Ajax
Hello,
I have some PHP knowledge but no ajax. I would like to convert following form to ajax:
http://www.cafewebmaster.com/web2-style-secure-flexible-free-php-contact...
Any idea how to do it easily?
Thanks