Hi all!

I'm part time university student. Now, most professors make their slides they use in their lectures available online.
One of those files is in .pdf format. This is not a problem to print, but the professor has used a blue background on almost all of the pages. If I'd have to print these pages as-is, then this will most likely cost me a fortune on ink.
So I'd like to remove that blue background. I have acrobat 5.0, but I can't seem to find out HOW to remove that background.
Any help is appreciated.

You can find the file I want to adjust here (careful, this is a sloooow site). Maybe you can have a look there first so you'll know what I mean.

TIA!