This plugin is no longer maintained as was built to fix an issue in a web app I built for my old company. For a better solution look at lolmaus's plugin...
https://github.com/lolmaus/jquery.dragbetter/
Special event created to handle true dragleave functionality.
HTML5 dragleave event works more like mouseout. This plugin was created to replicate the mouseleave style functionality whilst dragging.
$('#myelement').on('dragout',function(event){
// YOUR CODE
});