Problem viewing Actionscript in CS4

Hello
Ive just started using CS4 Flash and was editing the Actionscript to a carousel menu Ive bought for my website, but… for some reason, now when I hit F9 to view the script the only thing that happens is my timeline minimises to the bottom of the screen!!! and the same thing happens when I try Window > Actions (F9).
Has anyone had this problem or know how to sort it??? I hope so because its driving me up the wall, to put it nicly. :!:

Thank you!