     private var leftActivated : Boolean
     private var rightActivated : Boolean
 
+    private var pageUpActivated : Boolean
+    private var pageDownActivated : Boolean
+    private var homeActivated : Boolean
+    private var endActivated : Boolean
+
     private var zoomInActivated : Boolean
     private var zoomOutActivated : Boolean
     

            case 68: // D
                rightActivated = value
                break
                
            case Keyboard.NUMPAD_ADD:
            case 73: // I

        if( rightActivated )
            model.moveBy( horizontalStep, 0 )
        
        
        if( pageUpActivated )
            model.moveTo( model.viewport.x, 0 )
        
        if( pageDownActivated )
            model.moveTo( model.viewport.x, 1 )
        
        if( homeActivated )
            model.moveTo( 0, model.viewport.y )
        
        if( endActivated )
            model.moveTo( 1, model.viewport.y )
        
        
        if( zoomInActivated )
            model.zoomBy( 11/7 )
        
