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diff --git a/trunk/etherpad/src/etherpad/pad/revisions.js b/trunk/etherpad/src/etherpad/pad/revisions.js
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+/**
+ * Copyright 2009 Google Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS-IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import("jsutils.cmp");
+import("stringutils");
+
+import("etherpad.utils.*");
+
+jimport("java.lang.System.out.println");
+
+/* revisionList is an array of revisionInfo structures.
+ *
+ * Each revisionInfo structure looks like:
+ *
+ * {
+ *    timestamp: a number unix timestamp
+ *    label: string
+ *    savedBy: string of author name
+ *    savedById: string id of the author
+ *    revNum: revision number in the edit history
+ *    id: the view id of the (formerly the id of the StorableObject)
+ * }
+ */
+
+/* returns array */
+function _getRevisionsArray(pad) {
+  var dataRoot = pad.getDataRoot();
+  if (!dataRoot.savedRevisions) {
+    dataRoot.savedRevisions = [];
+  }
+  dataRoot.savedRevisions.sort(function(a,b) {
+    return cmp(b.timestamp, a.timestamp);
+  });
+  return dataRoot.savedRevisions;
+}
+
+function _getPadRevisionById(pad, savedRevId) {
+  var revs = _getRevisionsArray(pad);
+  var rev;
+  for(var i=0;i<revs.length;i++) {
+    if (revs[i].id == savedRevId) {
+      rev = revs[i];
+      break;
+    }
+  }
+  return rev || null;
+}
+
+/*----------------------------------------------------------------*/
+/* public functions */
+/*----------------------------------------------------------------*/
+
+function getRevisionList(pad) {
+  return _getRevisionsArray(pad);
+}
+
+function saveNewRevision(pad, savedBy, savedById, revisionNumber, optIP, optTimestamp, optId) {
+  var revArray = _getRevisionsArray(pad);
+  var rev = {
+    timestamp: (optTimestamp || (+(new Date))),
+    label: null,
+    savedBy: savedBy,
+    savedById: savedById,
+    revNum: revisionNumber,
+    ip: (optIP || request.clientAddr),
+    id: (optId || stringutils.randomString(10)) // *probably* unique
+  };
+  revArray.push(rev);
+  rev.label = "Revision "+revArray.length;
+  return rev;
+}
+
+function setLabel(pad, savedRevId, userId, newLabel) {
+  var rev = _getPadRevisionById(pad, savedRevId);
+  if (!rev) {
+    throw new Error("revision does not exist: "+savedRevId);
+  }
+  /*if (rev.savedById != userId) {
+    throw new Error("cannot label someone else's revision.");
+  }
+  if (((+new Date) - rev.timestamp) > (24*60*60*1000)) {
+    throw new Error("revision is too old to label: "+savedRevId);
+  }*/
+  rev.label = newLabel;
+}
+
+function getStoredRevision(pad, savedRevId) {
+  return _getPadRevisionById(pad, savedRevId);
+}
+