--- a/2048.html	Wed Sep 10 18:05:26 2014 +0300
+++ b/2048.html	Wed Sep 10 19:29:45 2014 +0300
@@ -335,11 +335,49 @@
       turnDom.innerHTML = '' + turn;
     }
 
+    ////////////////////////////////////////////////////////////////
+    // Game flow.
+
+    ui.game = {}
+
+    var messageDom = document.getElementById("message-area");
+    ui.game.clearMessage = function() {
+      messageDom.innerHTML = "";
+    }
+    ui.game.setMessage = function(msg) {
+      messageDom.innerHTML = msg;
+    }
+
+    ui.game.checkGameOver = function() {
+      if (board.gameOver(board.current)) {
+        ui.game.setMessage("Game over!");
+        return true;
+      } else {
+        return false;
+      }
+    }
+    ui.game.checkMoveValid = function(move) {
+      var tmpBrd = board.create();
+      board.copy(board.current, tmpBrd);
+      if (!(move in {"left":0,"right":0,"up":0,"down":0})) {
+        ui.game.setMessage("AI can't find move!");
+        return false;
+      }
+      if ( ! board.move[move].call(null, tmpBrd)) {
+        ui.game.setMessage("AI move "+move+" is ivalid!");
+        return false;
+      }
+      return true;
+    }
+
+    ////////////////////////////////////////////////////////////////
+    // Actions.
+
     ui.action = {};
 
     ui.action.start = function() {
       ui.score.clear();
-      ui.message.clear();
+      ui.game.clearMessage();
       ui.action.clearSuggestion();
       board.current = board.create();
       board.putRandom(board.current);
@@ -402,43 +440,13 @@
           case 37: ui.action.left(); break;
           case 39: ui.action.right(); break;
       }
+      event.preventDefault();
       return false;
     });
 
     document.getElementById("test").addEventListener("click", function() {
       board.move.replaceByBoardJS(ui.brdEngine);
     });
-    
-    ui.message = {};
-    var messageDom = document.getElementById("message-area");
-    ui.message.clear = function() {
-      messageDom.innerHTML = "";
-    }
-    ui.message.set = function(msg) {
-      messageDom.innerHTML = msg;
-    }
-
-    ui.action.checkGameOver = function() {
-      if (board.gameOver(board.current)) {
-        ui.message.set("Game over!");
-        return true;
-      } else {
-        return false;
-      }
-    }
-    ui.action.checkMoveValid = function(move) {
-      var tmpBrd = board.create();
-      board.copy(board.current, tmpBrd);
-      if (!(move in {"left":0,"right":0,"up":0,"down":0})) {
-        ui.message.set("AI can't find move!");
-        return false;
-      }
-      if ( ! board.move[move].call(null, tmpBrd)) {
-        ui.message.set("AI move "+move+" is ivalid!");
-        return false;
-      }
-      return true;
-    }
 
     ui.action.clearSuggestion = function() {
       var btns = document.querySelectorAll('div.move-control button');
@@ -447,28 +455,28 @@
     }
     ui.action.suggest = function() {
       ui.action.clearSuggestion();
-      ui.message.clear();
-      if (ui.action.checkGameOver())
+      ui.game.clearMessage();
+      if (ui.game.checkGameOver())
         return;
       var tmpBrd = board.create();
       board.copy(board.current, tmpBrd);
       var move = ui.ai.current.analyse(tmpBrd);
       ui.ai.current.cleanup();
-      if ( ! ui.action.checkMoveValid(move))
+      if ( ! ui.game.checkMoveValid(move))
         return;
       document.getElementById(move).classList.add('suggestion');
     }
     document.getElementById("suggest").addEventListener("click", ui.action.suggest);
     ui.action.step = function() {
-      ui.message.clear();
+      ui.game.clearMessage();
       ui.action.clearSuggestion();
-      if (ui.action.checkGameOver())
+      if (ui.game.checkGameOver())
         return;
       var tmpBrd = board.create();
       board.copy(board.current, tmpBrd);
       var move = ui.ai.current.analyse(tmpBrd);
       ui.ai.current.cleanup();
-      if ( ! ui.action.checkMoveValid(move))
+      if ( ! ui.game.checkMoveValid(move))
         return;
       board.move[move].call(null, board.current);
       board.putRandom(board.current);
@@ -478,7 +486,7 @@
     document.getElementById("step").addEventListener("click", ui.action.step);
 
     ui.action.finish = function() {
-      ui.message.clear();
+      ui.game.clearMessage();
       ui.action.clearSuggestion();
       var step = 0;
       var tsFrom = new Date().getTime();
@@ -487,7 +495,7 @@
         board.copy(board.current, tmpBrd);
         var move = ui.ai.current.analyse(tmpBrd);
         if (typeof move === 'undefined') {
-          ui.message.set("I don't know how to move!");
+          ui.game.setMessage("I don't know how to move!");
           return;
         }
         var updated = board.move[move].call(null, board.current);
@@ -496,7 +504,7 @@
         } else {
           ui.board.update(board.current);
           ui.score.update(board.current);
-          ui.message.set("Wrong move!");
+          ui.game.setMessage("Wrong move!");
           return;
         }
         step++; 
@@ -505,7 +513,7 @@
       ui.board.update(board.current);
       ui.score.update(board.current);
       ui.score.speed(step*1000.0/(tsTo-tsFrom), step);
-      ui.message.set("Game over!");
+      ui.game.setMessage("Game over!");
       ui.ai.current && ui.ai.current.cleanup();
     }
     document.getElementById("finish").addEventListener("click", ui.action.finish);