XPath expression prefixes

<<Continued from yesterday>>

I finally have my selectNodes function working. The only problem is
that I always have to use a prefix in my XPath expression, for example
"//ws:MasterRow". This prefix causes problems in IE however. Can I use
XPath in Mozilla on a Soap document without using prefixes in my XPath
expression?

Node.prototype.selectNodes = function(sExpr)
{
  //DOCUMENT_NODE = 9
  var doc = this.nodeType == 9 ? this : this.ownerDocument;
  var nsRes = doc.createNSResolver(this.node­Type == 9 ?
this.documentElement : this);

  var nsRes2 = function(s) {
    return "http://myservice.com";
  }

  var xpRes = doc.evaluate(sExpr, this, nsRes2, 5, null);
  var res = [];
  var item;
  while (item = xpRes.iterateNext())
    res.push (item); 
  return res ; 
}