Do you need to use Actionscript 3 code in Flash player 9 and above?

Question

Can anyone tell me if I need to use Actionscript 3 code instead of Actionscript 2 code in the following situation:
I am running a swf file which is contained in a browser window (all files are contained on a CD and I have a 'trust' file set up to let them play properly).  Up until now, I have been using the following Actionscript 2 code to close the browser window (the Actionscript 2 code is on an 'Exit' button within the swf):
on (release) {
getURL("javascript:window.close()");
This Actionscript 2 code has always worked and still works in Flash player 8 and lower.  However, it does nothing when played using Flash player 9.  Can anyone tell me if Flash player 9 won't recognize Actionscript 2 code?  Is it essential to use ONLY Actionscript 3 code if you are using Flash player 9?
I am having the same problem when I try to launch another html page containing a swf (popped up from the swf contained in the main html window).  I have the following code on the button to launch the popup html window.  It always worked, but suddenly no longer works with Flash player 9.  Here is the code I am using:
on (release) {
            getURL("javascript:launchWin2('webpage2.html');");
I have all the necessary background code to launch 'webpage2.html'.  It works everywhere except in Flash player 9.  Can anyone tell me if it is essential to use Actionscript 3 code ONLY on these buttons in Flash player 9?  I am pretty new to Actionscript 3, so any help with syntax would be appreciated. 
Please note that I don't want to use the projector.
Thanks!

Answer 1

You can use both AS2 and AS3 based applications in both Flash 9 and 10.
As for the issues you describe - perhaps Flash General Forum is a better bet:
http://forums.adobe.com/community/flash/flash_general