ction class="example">
         <h3>Example 1: </h3>
         <section class="description"><h2>Description</h2>
            <p>The following example is commonly used in HTML 4.01 to open new
                                windows when pages are loaded.</p>
         </section>
         <pre xml:space="preserve">
window.onload = showAdvertisement;
 function showAdvertisement()
 {
  window.open('advert.html', '_blank', 'height=200,width=150');
 }</pre>
      </section>
      <section class="example">
        