Asset widget : compatibility with any version of jQuery

Hi,

I'm using jQuery Update with jQuery 1.7. I've found out that Asset Widget is compatible with jQuery up to 1.5.

This can be easily fixed by replacing this line (asset-widget.js line 965) :
var $droppedField = $(event.target).find('.' + classMatch);

By :

var $droppedField = jQuery(this).find('.' + classMatch);

This code works also with JQuery 1.5.