// JavaScript Document
    $(document).ready(function() {
      $("#form1").validate({
        rules: {
          sender: "required",// simple rule, converted to {required:true}
          email: {// compound rule
          required: true,
          email: true
        },
        url: {
          url: true
        },
        message: {
          required: true
        }
        },
        message: {
          comment: "Please enter a comment."
        }
      });
    });