Drag and drop not working when receive from ajax

Dear All,
I have two pages with the similar codes. One is here Untitled Document in this page you have select the vehicle via the drop down list then a number of tyre will appear via the ajax call. The problem is that both the draggable and droppable is attached to it but is not working. On the other hand I have another page [url=]Untitled Document here which directly generate the tyre layout and both drag n drop works perfects fine. Both are using the same codes. Only one is via ajax. Any idea why it fails in ajax?