82723 Modification to script

I'd like the Floating Butterfly script at Dynamic Drive ([login to view URL]) altered a bit or something similar coded in it's place: whichever is easier. It should float a graphic all around a web page as now, but I'd like the graphic to occasionally take short pauses and hover for a bit. It should also display different graphics depending on whether it's going left, right, or pausing. I intend for the graphics to be of different sizes (the left and right graphics will be of the same size, but the paused graphic will be a different size), but if that's not possible I'll work around it.