Help on pop-up menu

Hi, I tried to build a pop-up menu followed by the following articles from Macromedia:

However, the action scripts (or something) for button “Portfolio” does not function normally. Could anyone help me check what’s wrong with it? You can download my file from: (26KB)

Thanks in advance!

you need frames below Portfolio. As you have it right now, it just plays for one frame and dissapears.

Thanks a lot!

Which layer should I insert frames for “Portfolio”?

Thanks! I insert a keyframe after frame 20 in “Topmenu buttons” layer and now it works fine.

However, the sample file that Macromedia provides doesn’t have key frame after frame 20, why does it function well?