Crazy behaviour in server?

[Elhombrebala]

If I upload a picture via PHP form it can not be seen (Even though I know it is there):
http://www.costa4seasons.com/img/DSCN1763.JPG
If I upload it via FTP, it can be seen:
http://www.costa4seasons.com/img/DSCN1762.JPG

Is this magic?
Has anyone an explanation?

[mfacer]

when you upload the pic via the site, does the folder have the right permissions?

I think that maybe when you upload you can set the permissions of the file - that unauthorised error message suggests that its not allowing guests to view the uploaded file.....