reading image in oracle form

hi
i have oracle form
text item << s_item
when i type item code , it show me some information of the item
i added image item to the form to display image of the item
i put the images "jpg" format under one folder  "item_photo"
but not all items has image
i want to display image item when i type item code in s_item
to avoid item not found
i created this function as i found

CREATE OR REPLACE FUNCTION file_exists(p_fname IN VARCHAR2) RETURN BOOLEAN
AS
  l_file UTL_FILE.FILE_TYPE;
BEGIN
  l_file := UTL_FILE.FOPEN(SUBSTR( p_fname, 1, instr(p_fname,'/',-1) ),
                           SUBSTR( p_fname, instr( p_fname, '/', -1)+1 ), 'r' );   
  UTL_FILE.FCLOSE( l_file );
  RETURN TRUE;
EXCEPTION
  WHEN UTL_FILE.INVALID_PATH      THEN RETURN FALSE;
  WHEN UTL_FILE.INVALID_OPERATION THEN RETURN FALSE;
END;

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then when validate item of s_item i added this code

IF ( file_exists( 'j:\Item_Photo\71030126.jpeg' ) ) then
	READ_IMAGE_FILE('j:\Item_Photo\71030126.jpeg','jpeg','genral.im_item');
end if

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but image not found as per the message
(the image is exist in the image folder)
i tried also to change from jpeg to jpg
but same error