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diff --git a/doc/asciidoc/javascripts/toc.js b/doc/asciidoc/javascripts/toc.js
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+/*
+ * IMPORTANT:
+ * This file (toc.js is) deprecated (superceded by asciidoc-xhtml11.js in
+ * AsciiDoc 8.5.1.  toc.js is retained for compatibility with user customised
+ * (pre 8.5.1) xhtml11 [header] and [footer] sections.
+ *
+ */
+
+/* Author: Mihai Bazon, September 2002
+ * http://students.infoiasi.ro/~mishoo
+ *
+ * Table Of Content generator
+ * Version: 0.4
+ *
+ * Feel free to use this script under the terms of the GNU General Public
+ * License, as long as you do not remove or alter this notice.
+ */
+
+ /* modified by Troy D. Hanson, September 2006. License: GPL */
+ /* modified by Stuart Rackham, October 2006. License: GPL */
+
+function getText(el) {
+  var text = "";
+  for (var i = el.firstChild; i != null; i = i.nextSibling) {
+    if (i.nodeType == 3 /* Node.TEXT_NODE */) // IE doesn't speak constants.
+      text += i.data;
+    else if (i.firstChild != null)
+      text += getText(i);
+  }
+  return text;
+}
+
+function TocEntry(el, text, toclevel) {
+  this.element = el;
+  this.text = text;
+  this.toclevel = toclevel;
+}
+
+function tocEntries(el, toclevels) {
+  var result = new Array;
+  var re = new RegExp('[hH]([2-'+(toclevels+1)+'])');
+  // Function that scans the DOM tree for header elements (the DOM2
+  // nodeIterator API would be a better technique but not supported by all
+  // browsers).
+  var iterate = function (el) {
+    for (var i = el.firstChild; i != null; i = i.nextSibling) {
+      if (i.nodeType == 1 /* Node.ELEMENT_NODE */) {
+        var mo = re.exec(i.tagName)
+        if (mo)
+          result[result.length] = new TocEntry(i, getText(i), mo[1]-1);
+        iterate(i);
+      }
+    }
+  }
+  iterate(el);
+  return result;
+}
+
+// This function does the work. toclevels = 1..4.
+function generateToc(toclevels) {
+  var toc = document.getElementById("toc");
+  var entries = tocEntries(document.getElementsByTagName("body")[0], toclevels);
+  for (var i = 0; i < entries.length; ++i) {
+    var entry = entries[i];
+    if (entry.element.id == "")
+      entry.element.id = "toc" + i;
+    var a = document.createElement("a");
+    a.href = "#" + entry.element.id;
+    a.appendChild(document.createTextNode(entry.text));
+    var div = document.createElement("div");
+    div.appendChild(a);
+    div.className = "toclevel" + entry.toclevel;
+    toc.appendChild(div);
+  }
+  if (entries.length == 0)
+    document.getElementById("header").removeChild(toc);
+}