Everything has worked brilliantly except for one thing.
The problem is that in Firefox 3.6 a transparent blue layer appears over the larger picture on selection as if it has been highlighted or selected. The blue transparent layer disappears if you click anywhere else on the page - this happens on both the example in the tutorial as well as on my page. I had a look at it on Firefox 3.5.8 and the problem doesn't occur.
Is there anything in the code that could be modified to avoid this happening?
Thanks for your help!
You might be better of with one of these: