Fixed update bug in setImage.
Fixed update bug in setImage.

svn path=/trunk/libavg/; revision=3649

yyd01245/libavg,libavg/libavg,scotty007/libavg,hoodie/libavg,yyd01245/libavg,scotty007/libavg,th3infinity/libavg,scotty007/libavg,hoodie/libavg,th3infinity/libavg,yyd01245/libavg,hoodie/libavg,scotty007/libavg,th3infinity/libavg,th3infinity/libavg,libavg/libavg,hoodie/libavg,yyd01245/libavg,libavg/libavg,libavg/libavg