Xaver, DG and Yachtsman, thanks very much for your quick responses. It was the mask that did it for me. I have now managed to get the effect I was looking for which I will put into a slide show I will be starting soon. Attached is a very quick example of what I am trying to achieve and now with a bit of time and patience I'll be able to get there. Thanks again. Rob Maybe the zip file isn't there, wouldn't attach, probably too large.