JQuery Validation Plug-In: Need Help w/ Dropdowns

<script type="text/javascript">
	jQuery.validator.addMethod(
		"require_categories",
		function(value, element) {
			if (element.value == 0) {
				return false;
			} else {
				return true;
			},
			"Please select an option."
		});
	$("#publishForm").validate({
		rules: {
			category: {
				require_categories: true
			}
		}
	});
</script>

<form id="publishForm" method="post">
<select name="category[]" id="county">
<option value="">--</option>
<option value="1">County Name</option>
...
</select>
</form>

	$("#publishForm").validate({
		rules: {
			'category[]': {
				require_categories: true
			}
		}
	});