SWF skips back to start

Hi, I’m hoping someone can help.

I have used anchors in a swf to allow me to link directly to an individual frame. It works fine when I click a link or type the URL into the browser & you can move freely trhough the swf using the navigation buttons. When the same link is called from a PHP script it has the following issue.

The swf opens at the correct frame however when you then click any of the navigation buttons the swf seems to reload and displays the 1st frame.

Any ideas?