try changing:
<body onload="initialize(); gup(); MM_preloadImages('plugins/images/btn_magazine_on.gif','plugins/images/btn_tracks_on.gif')" onunload="GUnload()">
to:
<body onload="initialize(); gup('<?php echo((isset($_GET['trkstate']))?$_GET['trkstate']:""); ?>'); MM_preloadImages('plugins/images/btn_magazine_on.gif','plugins/images/btn_tracks_on.gif')" onunload="GUnload()">