Load employee image in selfservice?

[jscrunch]

Hello to all,
I'm trying to view the employee image in Selfservice.
The idea is the following:
- When we enter in Preferences Menu --> Person Search Menu
- Then Customize for HR User --> Level : Responsability
(we choose a responsibility associed to Preferences) and then, inside the "advanced properties" for the columns we can associate an URL to the column we want...
- The idea is to associate an image (photo) to the employee number.. so we could use an url link to the blob column stored in fnd_lobs if the employee image would be stored as an attached document for the employee... or... a link to show the image column (lon raw) in per_images table... (I think this would be more difficult)
What I don't know ... how to do is how to show the image.. (how to build the url through the customization of the fnd_gfm.get procedure....


Another doubt in relation with that is..
When we show the image stored as an attachment in fndattch form, the internet explorer opens with the url
http://my_domain:8000/pls/my_project/fndgfm/fnd_gfm.get/42387354799/423868/fnd_gfm.jpg

the last number: 423868 is the file_id in fnd_lobs but... how about the other? how is it generated? Have this some relation with the problem to show with download_blob....?

Any ideas?

Thanks,
Jose.