Fixes detection logic for IE under XP SP2.

chrome_frame/CFInstall.js

Index: chrome_frame/CFInstall.js
===================================================================
--- chrome_frame/CFInstall.js	(revision 32183)
+++ chrome_frame/CFInstall.js	(working copy)
@@ -109,6 +109,7 @@
                    'top: 50%;' +
                    'border: 1px solid #93B4D9;' +
                    'background-color: white;' +
+                   'z-index: 2001;' +
                  '}' +
                  '.chromeFrameOverlayContent iframe {' +
                    'width: 800px;' +
@@ -131,6 +132,7 @@
                    '-ms-filter: ' +
                       '"progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";' +
                    'filter: alpha(opacity=50);' +
+                   'z-index: 2000;' +
                  '}';
     injectStyleSheet(rules);
     cfStyleTagInjected = true;
@@ -239,7 +241,11 @@
         '</tr>' +
       '</table>';
 
-    document.body.appendChild(n);
+    var b = document.body;
+    // Insert underlay nodes into the document in the right order.
+    while (n.firstChild) {
+      b.insertBefore(n.lastChild, b.firstChild);
+    }
     var ifr = makeIframe(args);
     byId('chromeFrameIframeHolder').appendChild(ifr);
     byId('chromeFrameCloseButton').onclick = closeOverlay;
@@ -271,10 +277,12 @@
       // We also only support Win2003/XPSP2 or better. See:
       //  http://msdn.microsoft.com/en-us/library/ms537503%28VS.85%29.aspx
       if (parseFloat(ua.split(ieRe)[1]) < 6 &&
-          ua.indexOf('SV1') >= 0) {
+          // 'SV1' indicates SP2, only bail if not SP2 or Win2K3
+          ua.indexOf('SV1') < 0) {
         bail = true;
       }
     } else {
+      // Not IE
       bail = true;
     }
     if (bail) {