Actionscript Help needed please!

I have a menu system that has a nice animation on it but I am having trouble getting the buttons to open up a URL without losing the animation.

I have put the relevant files up here:
http://www.sourcegrafikdesign.com/files.zip

It is just a CS3 fla file and it’s swf. I’m using Actionscript 2 but it may be possible to fix the problem using AS3.

I think it is a case of best practise, as everytime I try and add a command to open a URL it opens up either multiple pages or disrupts the animation. I’m not a ActionScripter and so haven’t been able to figure out where I’m going wrong. Any help would be greatly appreciated!

Regards
Hanniel