Or you can upload them to the BCUK Gallery and then link to them in your post.
Once you have uploaded the pictures go to the picture and right click on it, select properties and then copy the address of the picture. You need to make sure that you're looking at the main picture, not the thumbnail picture.
Then put these in tabs like this
if I put the address of a picture in there it looks like this
img]http://www.bushcraftuk.com/gallery/data/510/My_Pictures0010_Small_.jpg[/img (i've left the first and last bracket out so that you can see how it looks, you would need to make sure they're in to get it to display like this.
Hope that helps