Some don't see images, but links to the images
 

Hi !

I tried two different (usergroup) accounts on my board.
One of them got a post like it should be:
http://www.deorvanheemskerk.nl/bugs/good.JPG

But the other one didn't see the image, but only a link to it:
http://www.deorvanheemskerk.nl/bugs/bad.JPG

These accounts were tested on the same computer, with the same browsers (IE and FF).
I don't know how this happens, but want it to be like the first image for both accounts (usergroups)

How can this be fixed?
Greetz,

Tijmen