javascript - Need to work around selectSingleNode in IE10 -

my client has web app started throwing errors in ie10. tracked down source of error , seems ie 10 no longer supports selectsinglenode. here's function it's used:

      scormapi.prototype.settom = function( tom ) {          this.tom = createxmldocument();          var rootelem = importallnode( this.tom, this.tomtemplate.documentelement, true );          this.tom.appendchild( rootelem );          // transforms tracing of user in tracking template          // perform navigation on nodes of tom , each value found          // sets this.tom          rootelem = tom.selectsinglenode('//cmi');          this.parsexml( rootelem, '/' , this, this.settomparam );     }  

it's called following code:

      var ajxreq = new ajax.request(     this.baseurl+'?op=initialize',     {   method: 'post',          asynchronous:false,          postbody: strsoap,          requestheaders: {              'man':"post " + this.baseurl + " http/1.1",              'host':this.host,              "content-type":"text/xml; charset=utf-8",              "soapaction":this.serviceid + "initialize",              "x-signature":playerconfig.auth_request          }     });      if( ajxreq.transport.status == 200 ) {          try {              this.settom( ajxreq.transport.responsexml );          }     }  

i found suggestions change response type msxml-document, use queryselector or use jquery's find function, can't piece how implement in prototype framework. assistance appreciated.

as http://doogalbellend.blogspot.fr/2012/04/cross-browser-selectsinglenode-for-xml.html

update – no longer works in ie10, since selectsinglenode has been removed xml document returned ajax calls. can worked around setting response type of xmlhttprequest, :

xhr.responsetype = 'msxml-document';

modifying request adding responsetype: 'msxml-document' in options should work.