I used jqDnR, jqModal and jQuery for several months and had problems with drag and drop in Safari / Chrome or stuck in Firefox. I recommend switching to jQuery UI Draggable ...
http://jqueryui.com/demos/draggable/
I think that many of the functions that were originally in jqDnR / jqModal have been ported to ui-draggable. The switch was not too hard. The only downside (which is also in jqDnR) is the use of iframes in the draggable container. If the mouse moves too quickly to the iframe using the drag handle (or the drag area containing the iframe), the iframe seems to take away the mouse action and the drag hangs until you enter the drag area again. This requires a bit of hacking ...
Problem using jQuery UI.Resizable () and UI.Draggable () with iFrame
After you raise the hack, performance is better.
weezy source share