Window Picture and Fax Viewer

I've made myself a photo album program and i'm trying to get it to launch the albums into a slideshow created by "Window Picture and Fax Viewer".

I can get it to open and show the first photo in that album, but i dont know how to make it start the slide show straight away. The same way it does it when you goto a folder full of pictures, and you can click the "View as slide show" button.

I use this syntax..
rundll32.exe C:\WINDOWS\System32\shimgvw.dll,ImageView_Fullscre en path-to-album

Does anyone know how to do this?

Thanks
Marc