Javascript throwing error in IE. Works ok with Chrome.

I am calling the DoQuery() and AddRecord() APIs from the JavaScript. It works like a charm in chorme, However, its throwing me error in IE.The error it throws on the console: : 'XPathEvaluator' is undefined. Any ideas on how to get this working?

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">;
<html>
 <meta http-equiv="X-UA-COMPATIBLE" content="IE=Edge,chrome=IE8,IE10">
 <body>
  
  <script type="text/javascript" src="/js/QuickBaseClient.js"></script>
  <script type="text/javascript">

   var qdb = new QuickBaseClient();
   qdb.SetAppToken("apptoken");

   var fun= function() {
   
   var rrid= qdb.parseQueryString();
   
   if((rrid['rid'] == "")) {
     alert("Error, undefined variables present");
     return;
    }

   var rid=rrid['rid'];


   var queryString  = "{fid.EX."+rrid['rid']+"}";
   
  //Do Query

//Add Query


 
   };
   
   fun();


   
  </script>

 </body>
</html>