From 93edde50d251fdea7d90d3cd57ecc467193db5fd Mon Sep 17 00:00:00 2001
From: James Foster <james.mdb@gmail.com>
Date: Sun, 23 May 2010 12:11:14 +0800
Subject: [PATCH] Fix for IE6 compatibility

---
 lib/less/browser.js | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/lib/less/browser.js b/lib/less/browser.js
index 64f67b9f..e09008ba 100644
--- a/lib/less/browser.js
+++ b/lib/less/browser.js
@@ -62,7 +62,7 @@ function createCSS(styles, sheet, lastModified) {
 }
 
 function xhr(url, callback, errback) {
-    var xhr = new(XMLHttpRequest);
+    var xhr = getXMLHttpRequest();
 
     if (window.location.protocol === "file:") {
         xhr.open('GET', url, false);
@@ -75,12 +75,12 @@ function xhr(url, callback, errback) {
     } else {
         xhr.open('GET', url, true);
         xhr.onreadystatechange = function () {
-            if (this.readyState == 4) {
-                if (this.status >= 200 && this.status < 300) {
-                    callback(this.responseText,
-                             this.getResponseHeader("Last-Modified"));
+            if (xhr.readyState == 4) {
+                if (xhr.status >= 200 && xhr.status < 300) {
+                    callback(xhr.responseText,
+                             xhr.getResponseHeader("Last-Modified"));
                 } else if (typeof(errback) === 'function') {
-                    errback(this.responseText);
+                    errback(xhr.responseText);
                 }
             }
         };
@@ -88,6 +88,18 @@ function xhr(url, callback, errback) {
     }
 }
 
+function getXMLHttpRequest() {
+    if (window.XMLHttpRequest) {
+        return new(XMLHttpRequest);
+    } else {
+        try {
+            return new(ActiveXObject)("MSXML2.XMLHTTP.3.0");
+        } catch(ex) {
+            return null;
+        }
+    }
+}
+
 function log(str) {
     if (less.env == 'development' && typeof(console) !== "undefined") { console.log(str) }
 }