refresh slideshow screensaver automatically

I have a XP machine setup to show a screensaver from a shared folder. It runs all the time and when we want to add a new image to the screensaver, we just copy the new image to the shared folder from another computer. However, the new image does not display in the slideshow unless you stop the slideshow and let it restart. Is there a way to have this refresh automatically or have the image added to the slideshow whenever a new file is added to the folder?