Simple PHP/Javascript Form Validation (Online example)

Hi, I'm new here. I've been trying to work out how to validate a contact form using PHP & Javascript but most video tutorials haven't proven particularly useful so far. I've managed to code the Javascript side but would like some individual error messages classes as well as PHP server side validation. So quite simply what I would like is: • PHP/Javascript validation (in the style that I have already started, individual error messages would be a bonus) • PHP send script • A way to open a non modal version of the contact form if the user has Javascript is disabled. Here's my example: [login to view URL] (It's going in a modal box) I would do it myself but it would take me 10 times longer to figure out than you guys. Thanks! Nick