Make dragging an image in a link behave just like dragging the text in a link. We now generate the drag data for links just like we do when dragging an existing selection. r=brade@netscape.com sr=sfraser@netscape.com git-svn-id: svn://10.0.0.236/trunk@135524 18797224-902f-48f8-a5cc-f745e15eee43