Simple jQuery

Simple jQuery

What wrong with this code? I want to make something like http://www.nimpkish.com/blog/simple-javascript-image-gallery

<head>
<style>
#images_full img,
#images_thumbnails img {padding: 3px; border: 1px solid #CCC;}
#images_thumbnails img {margin: 4px;}
</style>
</head>
<body>
<script src="http://code.jquery.com/jquery-1.4.2.min.js"></script>
<script>
$('#images_thumbnails a').click()function(){
var newImageSrc = $(this).attr('href');
$('#images_full img').attr({'src': newImageSrc });
return false;
});
</script>

<div id="images_full"><img src="http://www.nimpkish.com/images/full_image/image1.png" /></div>

<div id="images_thumbnails">
<a href="http://www.nimpkish.com/images/full_image/image1.png"><img src="http://www.nimpkish.com/images/thumbnail/image1.png" /></a>
<a href="http://www.nimpkish.com/images/full_image/image2.png"><img src="http://www.nimpkish.com/images/thumbnail/image2.png" /></a>
<a href="http://www.nimpkish.com/images/full_image/image3.png"><img src="http://www.nimpkish.com/images/thumbnail/image3.png" /></a>
</div>
</body>

Thanks