[jQuery] Jorn Form Validation help - how to know when a select field is selected

[jQuery] Jorn Form Validation help - how to know when a select field is selected

Hi all
I have a dependent validation routine with Jorn Validation Form plugin. Works like a charm. But I need to validate dependent fields when a select field option is "selected".
Looks like
                    wife:{required: function() {return $("input[@name='maried_single']").filter('[@checked]').val() == "1";}},
But doesn't work. How to get the selected field option?