HTML5의 drag and drop

http://m.mkexdev.net/58


Drag & drop을 이용해서 객체를 복사하는 방법
http://stackoverflow.com/questions/13007582/html5-drag-and-copy

그리고...
http://stackoverflow.com/questions/11055170/html5-drag-and-drop-how-do-i-target-the-cloned-and-original-elements