If you convert the images to JPG instead of BMP (bitmap format), the file size will drop to probably 10% of what it is now. Maybe even less depending on the JPG quality you use when converting. If you need help finding a program to convert them, I am sure I can find a free simple one for you to use.
BMP stores pixel by pixel information so it takes up MUCH more data than a JPG which uses algorithms to reduce the size of the file. The image quality will be slightly lower, but it should be perfectly fine for what you are doing. I normally only use BMP files when creating web graphics or doing high res graphic design that can't have any compression.
I am guessing you probably already know all of this, but I figured I would post it just in case. Maybe I read your message wrong about the files being in BMP format.
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