Magnifying mouseover - how is it done?

Hi.
Can anyone tell me how to do this zoom effect on a web page, please?
You can see it used on the magazine cover picture on this site page...
http://www.houseandgarden.co.uk/

Thank you.

Regards,
Ceri

They're doing it in flash. I would imagine it's something like one clip laid over another and masked according to where the mouse is.

It's called a magnifying glass effect. Here's a tutorial on exactly how (although I like the way the houseandgarden circle disappears once you mouse out of the flash where the tutorial doesn't take it that far).
http://www.webwasp.co.uk/tutorials/b11- ... /index.php

Thank you. I'll try that
The vanishing circle is nice but this will do fine.

If anyone finds one with a vanishing circle, please post it too.

Regards,
Ceri

If you grasp the tuto, then you could probably do the same by detecting when the mouse leaves the movie - just pull the circle off stage and back on with mouse enter.