If you haven't used custom animations before, do the MS online training
courses on Animations
http://office.microsoft.com/en-au/training/CR061832731033.aspx so you
understand what I'm on about :-)

You need to put the photos off the side of the slide (change the zoom so you
can see) then add a motion path to each going from one side to the other
(holding down shift while you draw the line keeps it straight).  Change the
length of the animation or they whizz *really* quickly across the screen and
set each picture to start at different times (all this is easy in the
advanced timeline).  The last picture of the head honcho you could do
something different with like a slow fade entrance or something - have a play!

Hope that makes some sense.  Go away and have a play with it and post back
if you have any more questions.

Lucy

I wuld strongly recommend that you dont try to make ONE slide. Slides are
free make 100!

For each slide use 33% view so you can see around the slide and drag the
picture just off slide. In custom animation > motion paths. draw custom
choose scribble or curve and draw a path from the centre of the picture to
the centre of its final placement . Make this after previous. Add an exit
animation of choice after previous with a delay in timing tab. Slide
transition should be automatic after zero seconds. Make the other 99 slides!