diff --git a/lib/helperLib.js b/lib/helperLib.js
index 0148d74..3b74f95 100644
--- a/lib/helperLib.js
+++ b/lib/helperLib.js
@@ -17,6 +17,8 @@ var getAndSendRevHistory = require("./revAlgorithm.js").getAndSendRevHistory;
 var MessageQueue =require("./MessageQueue.js"); 
 console.log("MessageQueue", MessageQueue); 
 
+var CURRENT_TIMESTAMP = Date.now(); 
+
 module.exports = {
 
   validateParArr: function(parId, parArr){
@@ -121,21 +123,31 @@ function attachLogInListeners(socket){
   // });
 
 
+  var syncValidation = function(data, timestampData, queueData, emitData){
+    if(timestampData[1] != CURRENT_TIMESTAMP){
+      socket.emit("OFF_SYNC"); 
+    }
+    else{
+      CURRENT_TIMESTAMP = timestampData[0]; 
+      socket.broadcast.emit(emitData[0], emitData[1]); 
+      MessageQueue.queueOrDo(action); 
+    }
+  }
   //maybe emit sooner...
   //need to broadcast parentArray. 
-  socket.on("newNode", function(data){
-    MessageQueue.queueOrDo(['newNode', data, socket])
+  //timestampData=[CURRENT_TIMESTAMP, oldTime]
+  socket.on("newNode", function(data, timestampData){ 
+    syncValidation(data, timestampData, ['newNode', data, socket], ["dummy", 1234]); 
+    //(todo = set IDs on client (instead of negative Ids)); 
   });
   
 
-  socket.on("removeNode", function(data){ 
-    socket.broadcast.emit("removeNode", data);
-    MessageQueue.queueOrDo(['removeNode', data, socket])
+  socket.on("removeNode", function(data, timestampData){ 
+    syncValidation(data, timestampData, ['removeNode', data, socket], ["removeNode", data]); 
   });
 
-  socket.on("movedNode", function(data){
-    socket.broadcast.emit("movedNode", [data[0], data[2]]);
-    MessageQueue.queueOrDo(['movedNode', data, socket])
+  socket.on("movedNode", function(data, timestampData){
+    syncValidation(data, timestampData, ['movedNode', data, socket],[ "movedNode", [data[0],data[2]] ]); 
   });
 
 }
diff --git a/models/Node.js b/models/Node.js
index 65fc50b..06f9aaa 100644
--- a/models/Node.js
+++ b/models/Node.js
@@ -40,12 +40,12 @@ module.exports.addNode = addNode;
 //   return rootID;
 // }
 
-function findAndSocketSend(socket){
+function findAndSocketSend(socket, CURRENT_TIMESTAMP){
   var nodes = {'keeping': 'calm'}
   MyNode.find().populate('authorId','_id google.name' ).exec(function(err, nodes){
     if(!err){
       // require("underscore").each(nodes, function(node){console.log(node)}); 
-      socket.emit('nodeData', nodes)
+      socket.emit('nodeData', nodes, CURRENT_TIMESTAMP)
       return {'hell': 'yes'}
     }else{
       socket.emit('nodeData', "error!!!")
diff --git a/public/js/backbone/router.js b/public/js/backbone/router.js
index 1780e5c..2c7f8a4 100644
--- a/public/js/backbone/router.js
+++ b/public/js/backbone/router.js
@@ -1,4 +1,4 @@
-
+var CURRENT_TIMESTAMP; 
 var socket = null; 
 
 var AppRouter = Backbone.Router.extend({
@@ -99,14 +99,19 @@ var that = this;
 
 socket.emitWrapper = function(eventName, data){
 	console.log(this); 
-	if(this.socket.connected){ this.emit(eventName, data); }
+	if(this.socket.connected){
+		var oldTime = CURRENT_TIMESTAMP; 
+		CURRENT_TIMESTAMP = Date.now(); 
+		this.emit(eventName, data, [CURRENT_TIMESTAMP, oldTime]); 
+	}
 	else{ //(alert + lock)
 		alert("Internet connection down. Edits not synced. Refresh when back online."); 
 	}
 }
 
-socket.on('nodeData', function(data){
+socket.on('nodeData', function(data, SERVER_TIMESTAMP){
 	//alert("data");
+	CURRENT_TIMESTAMP = SERVER_TIMESTAMP; 
 	console.log(data);
 	nodesCollection = new NodesCollection(data); 
 	var id = nodesCollection.findWhere({text: "0root"}).get("_id");
@@ -267,15 +272,20 @@ socket.on("revControl", function(data){
 	//To be continued...
 }); 
 
-socket.on("VALIDATE", function(data){
-	var parId = data[0]; 
-	var parArr = data[1]; 
-	var thisParArr = nodesCollection.findWhere({_id: parId}).get("children"); 
-	if(!_.isEqual(thisParArr, parArr)){
-		alert("syncing error.Edits no longer synced. Please refresh browser"); 
-		socket = null;  
-	}
-});
+socket.on("OFF_SYNC", function(){
+	alert("syncing error.Edits no longer synced. Please refresh browser"); 
+	socket = null;  
+}); 
+
+// socket.on("VALIDATE", function(data){
+// 	var parId = data[0]; 
+// 	var parArr = data[1]; 
+// 	var thisParArr = nodesCollection.findWhere({_id: parId}).get("children"); 
+// 	if(!_.isEqual(thisParArr, parArr)){
+// 		alert("syncing error.Edits no longer synced. Please refresh browser"); 
+// 		socket = null;  
+// 	}
+// });
 
 
 socket.emit("nodeRequest");