Use a photo editing program such as:
JASC Paint Shop Pro
Adobe Photoshop Elements
Adobe Photoshop
Microsoft PhotoDraw (if you can find a copy)
there are others and some freeware you can download.
The freeware is not as good, but may get what you want.
You will be able to edit your photos down to managable
size for importing into your slide.
Some of the above have a free trial download.
-----Original Message-----
How can I have multiple photos in one slide? I want to
run a "mini slide show" in one slide.