Colin you made a simple error. When you post into the IMG line you must make sure that the http:// is not duplicated ie http:// is already in the img line when you open it, when you paste the address in that line you might end up with: http://http://www.pbsbac.co.uk/photoalbum/albums/userpics/11191/boblin2No1.jpg
Note the beginning of the line that's highlighted. Delete one http:// and your picture should then appear.
If you get stuck give me a call when your on your computer and I will talk you through it
Martin