Automatic batch image reduction

Hey everyone!
I work as a document control administrator and im in charge of 1500 word, powerpoint and excel documents. People at my company create these and send them to me to control and place onto out intranet.

What the problem is.

Not everyone here at my company are computer savey and place 4-6 megapixel images into a excel or powerpoint document, sometimes multiple images. What this does is create a 50-150MB file...

A work around solution.
Right clicking on the image, format for web or email 96 or 200 dpi. Do this for all images. File Save.
Reduces most documents by 90%

My question.
Can or has there been a program designed to creat a batch of documents to reduce image quality automaticly?

What I would like to do.
Select various documents, run batch command, reduce all images and have the program save the files with the same name.

Any help would be wonderful

Thanks to all, or who ever replys.