Making a Chess Game with jQuery UI. I have used Draggable, but i need to make them not stack
<p>I have made this chess game, but i need help with the accept setting in jQuery UI Droppable. </p>

<p>Here is the fiddle:
<a href="http://jsfiddle.net/kevinsimper/ZzHjz/3/" rel="nofollow">http://jsfiddle.net/kevinsimper/ZzHjz/3/</a></p>

<p>I tried to do that, when you drop something, it will update all the td there are empty, but it do not seems to work.</p>

<p>Can you help me?</p>
