JQuery :: Simple Animation - Image Move Up To Show Bottom

This is meant to be a very simple animation. Everything seems to be correct, but it doesn't seem to run. Basically it is a system where the image is 50px taller than the box it is being displayed in. When you hover over the image, the image is meant to move up via jquery to show the bottom (previously hidden) 50px and cut off the top 50px.

Here is my Site: [URL]
Here is my HTML:
Code:
<div id="container"><div>
<a class="none" href="<?php the_permalink() ?>"><img src="/themes/smo/portfolio/<?php echo get_post_meta($post->ID, 'portfolio_img',true).".gif"; ?>" alt="" /></a>
</div></div>

Here is the Jquery:
Code:
$(function(){
$("div.container div a").hover(function(){
$("img", this).stop().animate({top:"-51px"},{queue:false,duration:200});
}, function() {
$("img", this).stop().animate({top:"0px"},{queue:false,duration:200});
});
I think its something to do with the container class.