I've setup a few forms for a client that use the normal validation to check and make sure fields have been inputted with the right info. Everything seems to work fine on IE7, FF and Safari however the validation doesn't occur at all in an IE6 environment.

The pages can be seen here in a normal 'Contact Us' page and and here in a lead generation/information gathering page.

Both have custom error messages for sections and error placement, everything should be working right but obviously it's not.