Need help with zoom


I’m it making a book in the flash, that is it function fine… but now I want to put a magnifying glass effect when the mouse passes over some objects of that page, more or less like in this site: page 18/19

My problem is that I can’t make the magnifying glass appear only when the mouse is over it, I tried with the rollover…but is not working. Is there any way do this?

Thank you for the help