I'm having a little trouble understanding the overall picture. If you
want to skip slides 4 and 5, I think the best way is to set them to
hidden. Then you can set slide 3 to advance automatically, and it will
jump right to slide 6. If later in the slide show, you want to view
slides 4 and 5, you can hyperlink to them. If that doesn't help, perhaps
you can tell us a little more about the overall slideshow (e.g., what's
the purpose of slides 4 and 5 if you are skipping them? is everything
automatic or just the jump from slide 3 to 6? if not, what do you do to
get to slide 3? etc.).
--David