Every click on "Move" button will move DIV element to the random table cell (except the start position). If "Clone" checkbox is set then instead of moving DIV element it will be cloned and moved to the random cell. Cloned DIV element will be appended to the existing cell content unless "Overwrite" checkbox is checked.

Please see JS code in script.js file and try to replace callback function with the line below. Actually, callback function will start animation again. Once started, animation will not stop until page is refreshed. It's a very attractive effect.