I’m using the jQuery validation plugin (http://bassistance.de/jquery-plugins/jquery-plugin-validation/), and it’s working on most everything except 2 select boxes. I’ve created a fiddle here to demonstrate one of these troublesome select boxes: http://jsfiddle.net/tucsonlabs/mQJCX/
If you leave the month blank and submit the form there’s no error message generated even though the element has a class of required.
You have used same name for the day and month field, so the plugin validated the first instance only. If you change the name of any one field, it will function normally.