if (variable>=1){

[Ameretat]

Cesspenar is right about the Flash security, but there is a way round it as Adobe itself has suggested and it is to use an XML file called crossdomain.xml in this file you can list the URL of the sites you want to allow to access your Flash file, which in your case would be the URL of your second website!

crossdomain.xml:

<?xml version="1.0"?>
<!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd">
<cross-domain-policy>
   <allow-access-from domain="www.site2.com" />
</cross-domain-policy>

hope this helps!