Flash CS3 popup

I have been trying to make a popup window from a flash button which is within a movieclip, published using flash cs3 and actionscript 2.0, but it doesn’t seem to work.

I have had a look at http://www.kirupa.com/developer/mx/centered_popup.htm as well.
This works fine with MX, but when I use the same code in flash CS3, the window does not popup… what could be wrong?

The downloadable .fla file shows that it was published using flash settings as flash 5.0… does that mean I will be unable to publish it as flash 9.0?

Can someone please guide me on this?