By default, Validation Select widgets require the user to make a selection before submitting the form. You can, however, make selections optional for the user.
To change the required status of a select list,
add the isRequired property to the constructor
and set its value to false, as follows:
<script type="text/javascript">
var selectwidget1 = new Spry.Widget.ValidationSelect("spryselect1", {isRequired:false});
</script>