I was originally trying to create a small box which would float with the full alphabet on it so that the viewer could click on any letter and it could take them to the right letter but felt that I was being a bit too ambitious and settled for the floating up arrow. The box would be similar to http://www.procoprint.co.uk/yp-printingglossary.htm (the box on the right at the top, but would float as you moved up or down.

thanks