[jQuery] how to enable drag drop using this plugin

I am using thise plugin.<a href="http://www.isocra.com/2008/02/table-drag-and-drop-jquery-plugin/"> http://www.isocra.com/2008/02/table-drag-and-drop-jquery-plugin/</a>
Using thise plugin, how to drag only row within class='dro'.
I not want to drop all rows, only row within class='dro'
Thnks.