powerpoint

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I have put a powerpoint presentation as is (ie not
converted it to html) into a web. it opens fine and
starts to play but everytime it gets to the 3rd slide
(regardless of what that slide is) it stops and you need
to scroll down to get to the next frame (no, 'advance on
mouse click' is not the option for the slide). the
presentation is playing within a frame, but when i edit it
so it plays in its own window it runs through fine. so
basically, any ideas as to why a presentation won't play
all the way thru when its in a frame? i need to keep it
in a frame and keep it as the original ppt file (its for
an intranet thing).

thank you.