Pull Down Advert. How is it done?

http://demo.eyeblaster.com/Europe/OfflineDemo/Panasonic/panasonic.htm

Move your mouse over the panasonic banner.

I have created the flash movie with transparency but i would like to know how to implement the mouse over effect so when the mouse is placed over the small movie, it expands vertically and plays the whole movie without pushing the web page downwards as is the case with this effect???

I am near to finishing it, yet so far!!!

Please can someone help me with this?

Thanks in advance.

B.