jquery steps error class code example

Example: jquery steps next button event

<form id="example-form" action="#">    <div>        <h3>Account</h3>        <section>            <label for="userName">User name *</label>            <input id="userName" name="userName" type="text" class="required">            <label for="password">Password *</label>            <input id="password" name="password" type="text" class="required">            <label for="confirm">Confirm Password *</label>            <input id="confirm" name="confirm" type="text" class="required">            <p>(*) Mandatory</p>        </section>        <h3>Profile</h3>        <section>            <label for="name">First name *</label>            <input id="name" name="name" type="text" class="required">            <label for="surname">Last name *</label>            <input id="surname" name="surname" type="text" class="required">            <label for="email">Email *</label>            <input id="email" name="email" type="text" class="required email">            <label for="address">Address</label>            <input id="address" name="address" type="text">            <p>(*) Mandatory</p>        </section>        <h3>Hints</h3>        <section>            <ul>                <li>Foo</li>                <li>Bar</li>                <li>Foobar</li>            </ul>        </section>        <h3>Finish</h3>        <section>            <input id="acceptTerms" name="acceptTerms" type="checkbox" class="required"> <label for="acceptTerms">I agree with the Terms and Conditions.</label>        </section>    </div></form>