Swfobject.js and flash vars problem... HELP!

Having a problem using variables with swfobject.js … what am I doing wrong? trying it two ways here:

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
 <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
 <META HTTP-EQUIV="Pragma" CONTENT="no-cache">
 <script type="text/javascript" src="swfobject.js"></script>
 <body bgcolor="#000000"  leftmargin="0" topmargin="0" marginheight="0" marginwidth="0">
 <div id="flashcontent"><br><br><font color="#ffffff">This site requires Flash Player 7 or greater to function correctly.<br>Please download <a href="http://www.macromedia.com/go/getflash" target="_blank"><font color="#ffffff"><u>HERE</u></font></a></font>
 <script type="text/javascript">
    var so = new SWFObject("RisingStar.swf", "RisingStar", "450", "213", "8", "#000000");  
    so.addVariable("xmlFile", "");
    so.addParam("flashvars", "xmlFile=");

here’s my AS:

 _global.xmlFinishedLoading = false;
 my_xml = new XML();
 my_xml.ignoreWhite = true;
 my_xml.onLoad = function(sucess) {
        if (sucess) {
             trace ("XML loaded");
             _global.xmlStuff = new XML(this);
         } else {
             _root.debug.text = "couldn't load XML file";
 //loading xml from html variable
 _global.baseURL = "";