Use a cross-frame compatible instanceof check - Closes #2172.
Use a cross-frame compatible instanceof check - Closes #2172.

Also see
http://perfectionkills.com/instanceof-considered-harmful-or-how-to-write
-a-robust-isarray/

blueimp/jQuery-File-Upload,blueimp/jQuery-File-Upload,blueimp/jQuery-File-Upload,blueimp/jQuery-File-Upload,Verde1705/verde1705.github.io,GrizliK1988/PhotoWidget,Verde1705/verde1705.github.io,blueimp/jQuery-File-Upload,blueimp/jQuery-File-Upload