Looks like the reason behind it is that the files are held on a server that the firewall/websense software blocks out. I should be able to see them when i use my home connection, but all i see on this post are several very small white spots. They appear to be directly linked to
http://www.gameplanet.co.nz/~grover/sf/sf092.jpg.
I imagine there will be many other people that when doing what so many people do whilst at their place of work, is to check out the forums, will also not be able to view them if their companies use anyform of websensing software.
Could you not use the yabbupload system instead?