jQuery validate form

example from:
http://code.runnable.com/UZJ24Io3XEw2AABU/how-to-validate-forms-in-jquery-for-validation

  <script src="//code.jquery.com/jquery-1.9.1.js"></script>
  <script src="//ajax.aspnetcdn.com/ajax/jquery.validate/1.9/jquery.validate.min.js"></script>
 

  <form action="" method="post" id="register-form" novalidate="novalidate">
 
    <div class="label">First Name</div><input type="text" id="firstname" name="firstname" /><br />
    <div class="label">Last Name</div><input type="text" id="lastname" name="lastname" /><br />
    <div class="label">Email</div><input type="text" id="email" name="email" /><br />
    <div class="label">Password</div><input type="password" id="password" name="password" /><br />
    <div style="margin-left:140px;"><input type="submit" name="submit" value="Submit" /></div>
   
  </form>







$(function() {
 
    // Setup form validation on the #register-form element
    $("#register-form").validate({
   
        // Specify the validation rules
        rules: {
            firstname: "required",
            lastname: "required",
            email: {
                required: true,
                email: true
            },
            password: {
                required: true,
                minlength: 5
            },
            agree: "required"
        },
       
        // Specify the validation error messages
        messages: {
            firstname: "Please enter your first name",
            lastname: "Please enter your last name",
            password: {
                required: "Please provide a password",
                minlength: "Your password must be at least 5 characters long"
            },
            email: "Please enter a valid email address",
            agree: "Please accept our policy"
        },
       
        submitHandler: function(form) {
            form.submit();
        }
    });

  });