Im starting to learn jquery. I have a question..

I have a banner and this banner have some thumbnail images. When i click on any thumb, it changes to a bigger size of the thumb. But it only changes when the user clicks on a thumb image. I need it to automatically swap in X seconds.

So, I have:

<div id="banner">

      <img src=˜img1.jpg˜ />

      <img src=˜img2.jpg˜ />

      <img src=˜img3.jpg˜ />

</div>

<div id="thumb">

      <img src=˜thumb_img1.jpg˜ />

      <img src=˜thumb_img2.jpg˜ />

      <img src=˜thumb_img3.jpg˜ />

</div>