The way Pinky suggests is still a host - although the chance of anyone seeing it is very slim cos there are millions of randomly names files on there - but it still on the internet.
What you can do if you like Nay is create an account on Google Picasa http://picasa.google.com/ you have the software on your computer - you add you pics to an album on there and upload it to the web album- you have options like people can only open it with a secret password, or can only open it using the link - the link is the way to go cos that means you can put the link to the slideshow of photos in the forum (which only we can see)
Hope that makes sense! If not just say so and I'll go through it properly!