run xpath on non document element nodes

package.json

@@ -1,14 +1,14 @@
 {
     "name": "xpath.js",
-    "version": "0.0.1",
+    "version": "0.0.3",
     "description": "Xpath pure javascript implementation for node.js",
     "engines": { "node": ">=0.4.0" },
     "author": "Cameron McCormack (http://mcc.id.au/xpathjs), Yaron Naveh ([email protected], http://webservices20.blogspot.com/)",
     "dependencies": {
 
      },
      "devDependencies": {
-        "nodeunit": ">=0.6.4",        
+        "nodeunit": ">=0.6.4"
      },
     "repository" : { 
         "type":"git", 

sample.js

@@ -0,0 +1,8 @@
+var select = require('xpath.js')
+    , dom = require('xmldom').DOMParser
+
+var xml = "<book><title>Harry Potter</title></book>"
+var doc = new dom().parseFromString(xml)    
+var nodes = select(doc, "//title")
+console.log(nodes[0].localName + ": " + nodes[0].firstChild.data)
+console.log("node: " + nodes[0].toString())

xpath.js

@@ -1,4 +1,4 @@
-/*
+/*
  * xpath.js
  *
  * An XPath 1.0 library for JavaScript.
@@ -4278,12 +4278,17 @@ try {
 
 function SelectNodes(doc, xpath)
 {
-	var parser = new XPathParser();
-	var xpath = parser.parse(xpath);
-	var context = new XPathContext();
-	context.expressionContextNode = doc.documentElement;
-	var res = xpath.evaluate(context)	
-	return res.toArray();	
+  var parser = new XPathParser();
+  var xpath = parser.parse(xpath);
+  var context = new XPathContext();
+  if(doc.documentElement){
+    context.expressionContextNode = doc.documentElement;
+  } else {
+    context.expressionContextNode = doc;
+  }
+  var res = xpath.evaluate(context)
+
+  return res.toArray();
 }
 
 module.exports = SelectNodes;