If thats your whole show ie no more slides try this
Stack all your pics directly on top of each other (same size helps)
Drag a selection rectangle around them to select all
slide show > custom animation >add effect> entrance > fade > after previous
then also
add effect>exit > fade > after previous
select the first entrance and exit (ctrl click) and press remove
Now set transition to auto after 0 secs and slide show > set up show to loop
until esc
If you want to use other slides in your pres make this a custom show and
have a hyperlink from the main show with "show and return" ticked
Hope that makes sense
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_____________________________
John Wilson
Microsoft Certified Office Specialist
http://www.technologytrish.co.uk/ppttipshome.html