I am not sure what is your best solution but you can convert your PP slide
show to html and upload it to your web server and link to it from your main
Publisher site. Look in the Help section in PP to figure out how to convert
it to html or post on the PP group for help.
You could also import the html version of your PP slide show using an
Iframe. You could also copy and paste your slides to pages on Publisher. And
if your PP slide show is just pictures you can use a more suitable slide
show program such as JAlbum, Porta or the many web slide shows that can be
produced using Irfanview, Picasa and other image editing programs.
DavidF