Microsoft Digital Media Keyboard How Do I Zoom, Using The Zoom Buttons On My Microsoft Digital Media Keyboard 3000?

How do I zoom, using the zoom buttons on my Microsoft Digital Media Keyboard 3000? - microsoft digital media keyboard

Hello, I have a problem with my zoom buttons on my keyboard DMK 3000th The problem is that if I were the most and least like a magnifying glass, looking as Page Up and Page Down.

Works well with Internet Explorer 7, but with Mozilla Firefox and Internet Explorer 8 zoom buttons not working properly, as Page Up and Page Down keys is annoying.

Has anyone a solution for this problem?

Thank you.