I've got a form in HTML where I'd like the user to fill in all the details before hitting the Submit button. Right now, the form works, but if a entry is left blank, the form stil gets submitted.
I'd like to know how to prompt the user that certain areas aren't filled in.. and then reload that form with the headings of each uncompleted section highligted in a different color.
Can this be done in HTML instead of PHP? It'll save me the trouble of installing PHP compilers and such on a friend's PC