Excellent! This fixes one of the problems with these forms (another being that once you click the "save" button you're not taken back up to the top of the page as you should be). It works great on the "Join" form but I also can't get it to work on the "profile edit". I noticed that the alert code is closed in the instructions for the Join form:
alert('Alert: There are errors in your profile entries, please correct the fields marked by a red ! next to it.');
but see more not for the Profile:
alert('Alert: There are errors in your profile entries, please correct the fields marked by a red ! next to it.'
but I changed that and it still doesn't work.
Otherwise - clear instructions and free - it doesn't get much better than that!