Flash Going outside its Boundaries

[FONT=Times New Roman][SIZE=3]Hi[/SIZE][/FONT]

[FONT=Times New Roman][SIZE=3]I saw a Flash advert on yahoo.com and when I hovered over different buttons in the advert the button expanded and seemed to go outside the flash window and into the main html page.[/SIZE][/FONT]
[FONT=Times New Roman][SIZE=3]Without going over the flash section and right clicking where the flash expands to the normal internet menu appear rather than the flash one, but right clicking on the same area when the button was expanded it showed the flash right click menu.[/SIZE][/FONT]

[FONT=Times New Roman][SIZE=3]Does anyone have a clue how to do this? I have attached a picture to show what I mean and the files if anyone wants to take a look.[/SIZE][/FONT]

[FONT=Times New Roman][SIZE=3]Cheers[/SIZE][/FONT]

http://img503.imageshack.us/my.php?image=boundaries4ay.gif