Hi,
Thanks Amy and HighlandScenic for your replies. I was using Internet Explorer 7 browser whilst having the problems I described. I tried using Firefox and that solved the problem.
Thanks once again for your help.
Sorry, to be a pain but, I still can't figure out how to vote for pictures. I know how to comment on them, but can't find a button to click on to vote. Does making a comment count as a vote?