Prevent jqueryui from triggering mouseup in ie8.
Prevent jqueryui from triggering mouseup in ie8.

hbaptiste/jqTree,bolster/jqTree,mbraak/jqTree,hbaptiste/jqTree,bolster/jqTree,mbraak/jqTree,hbaptiste/jqTree,bolster/jqTree,mbraak/jqTree