HOW TO PREVIEW IMAGE BEFORE UPLOAD

Hi,

my APEX : 4.2.6

database : 11g

on AIX

i insert images in table TAB_IMG

ALL IS OK

but i would like to have a preview before to upload these images

i do :

I'm uploading an image (with browser item)  with wwv_flow_files

i would like display this image before submit the form

i created a browser item = P50_IMG1  with wwv_flow_files

i want to display my image on the same line (item P50_IMG11 :  DISPLAY IMAGE ITEM)

i declared a dynamic action : when P50_IMG1 is not null ==> display P50_IMG11

my item P50_IMG11 is "display image item" = return blob column from sql