I am trying to use a slideshow(http://dynamicdrive.com/dynamicindex...nslideshow.htm) on my website. I want to know if there is anyway to set the sort order to sort descending rather than acsending.

My guess is that it would be in this code...

if (typeof displayorder!="undefined")
theimages.sort(function() {return 0.5 - Math.random();})

That function is sorting randomly. You need to write your own function to sort in descending order.
Use this function to sort in descending order:

function compare(x, y)
{
  return ((x < y) ? 1 : ((x > y) ? -1 : 0));
}
theimages.sort(compare);

Thanks that works.