Thanks Dave. I think the problem I did was create several glideshows (a separate glideshow for each piece) in one large presentation. But if I wanted to move one of the pieces to earlier in the presentation, I didn't know how to move an entire glideshow. I wanted a separate gliding background for each new piece.
No problem, thanks for the additional details. It might not have been possible in that case then, as it isn't possible to change the layout order of main elements like multiple glideshows, so the best option would be to edit and change the picture manually for each. You might want to try out having them all in a single glideshow if you're doing other similar projects in the future and need to be able to change the image order easily.