Thats right, I meant some javascript to popup with friendly error messages if it hasnt been filled in properly, before submitting it to the server. My JS isn't too hot, but I can easily wack the page through dreamweaver and use one of the form validation extensions to achieve what i want. (I dont intend to replace the important server-side checks though) thanks.
Its actually pretty easy. The things you have to remember is name your form object which goes in the JS code, make sure that the images that get changed to the error images are named.