// JavaScript Document
         $.validator.setDefaults({
            submitHandler: function() { alert("submitted!"); }
         });
         $().ready(function() {
            // validate the comment form when it is submitted
            $("#commentForm").validate();
            
            
            // propose username by combining first- and lastname
            $("#username").focus(function() {
               var firstname = $("#firstname").val();
               var lastname = $("#lastname").val();
               if(firstname && lastname && !this.value) {
                  this.value = firstname + "." + lastname;
               }
            });
            //code to hide topic selection, disable for demo
            var newsletter = $("#newsletter");
            // newsletter topics are optional, hide at first
            var inital = newsletter.is(":checked");
            var topics = $("#newsletter_topics")[inital ? "removeClass" : "addClass"]("gray");
            var topicInputs = topics.find("input").attr("disabled", !inital);
            // show when newsletter is checked
            newsletter.click(function() {
               topics[this.checked ? "removeClass" : "addClass"]("gray");
               topicInputs.attr("disabled", !this.checked);
            });
         });