How to enable browser's back button with SWFAddress?

The online samples on asual.com work with back button for me, and this disturbs me most of all.

I've installed SWFAddress as they discribed in the tutorial.

I have  SWAddress.js in the folder

and i have this script in my html wrapper:

<script type="text/javascript" src="swfaddress/swfaddress.js" charset="utf-8"></script>

        <script type="text/javascript" src="swfobject.js" charset="utf-8"></script>

        <script type="text/javascript">

            <!-- For version detection, set to min. required Flash Player version, or 0 (or 0.0.0), for no version detection. -->

            var swfVersionStr = "9.0.0";

            <!-- To use express install, set to playerProductInstall.swf, otherwise the empty string. -->

            var xiSwfUrlStr = "playerProductInstall.swf";

            var flashvars = {};

            var params = {};

            params.quality = "high";

            params.bgcolor = "#ffffff";

            params.allowscriptaccess = "sameDomain";

            params.allowfullscreen = "true";

            var attributes = {};

            attributes.id = "Upgradeshop";

            attributes.name = "Upgradeshop";

            attributes.align = "middle";

            swfobject.embedSWF(

                "Upgradeshop.swf", "flashContent",

                "100%", "100%",

                swfVersionStr, xiSwfUrlStr,

                flashvars, params, attributes );

            <!-- JavaScript enabled so display the flashContent div in case it is not replaced with a swf object. -->

            swfobject.createCSS("#flashContent", "display:block;text-align:left;");

        </script>

and it works for me, but my event handler for SWFAddress.onChange do not recieve any events after back button is pressed.