[jQuery] jquery validation question: validate a single form element onsubmit

[Eben Goodman]

I'm using the validate plugin, and am having a problem with simple one
element forms.  I have a single select list and a submit button.  If the
select list is empty, the validation prompts that it is required.  When you
choose an option, and click Submit, it validates and removes the required
message, but then you have to click Submit a second time to actually submit
the form... what would I need to do to have it validate the select onchange,
so the submit fires the form submit?
validation code:
<script language="Javascript">/* validation for radio button forms */
// wait for the DOM to be loaded
$(document).ready(function() {
    // validate form on keyup and submit
var validator = $('#select').validate({
       rules: {
field: "required"
       },
       messages: {
field: "Please select a value."
       }
    });
});
</script>

Any advice is appreciated.