Javascript: Add class to required input from jQuery validate

gistfile1

function markRequiredField(form_id){
	var rules = $('#'+form_id).validate().settings.rules;
	$.each(rules, function(input) {    			
        if (rules[input].hasOwnProperty("required") && rules[input].required == true){
        	$('input[name="'+input+'"]').addClass("requiredClass");
        }
    });
}