diff --git a/400-SOURCECODE/AIAHTML5.Web/app/controllers/DAController.js b/400-SOURCECODE/AIAHTML5.Web/app/controllers/DAController.js
index fae0173..a75ff44 100644
--- a/400-SOURCECODE/AIAHTML5.Web/app/controllers/DAController.js
+++ b/400-SOURCECODE/AIAHTML5.Web/app/controllers/DAController.js
@@ -1384,6 +1384,8 @@ function ($scope, $rootScope, $compile, $http, $log, $location, $timeout, DA, Mo
 
             if (evt.ctrlKey) {
                 $rootScope.multiAnnotationIsON = true;
+
+                document.getElementById("btnZoom").setAttribute('disabled', 'disabled');
             }
             else {
                 if (($rootScope.previousHighlightList != null || $rootScope.previousHighlightList != undefined) && ($rootScope.previousHighlightList.length > 0)) {
@@ -1391,6 +1393,8 @@ function ($scope, $rootScope, $compile, $http, $log, $location, $timeout, DA, Mo
                 }
 
                 $rootScope.multiAnnotationIsON = false;
+
+                document.getElementById("btnZoom").disabled = false;
             }
 
             //get mouse coordinate of mirror image click
@@ -1758,12 +1762,23 @@ function ($scope, $rootScope, $compile, $http, $log, $location, $timeout, DA, Mo
 
             if (evt.ctrlKey) {
                 $rootScope.multiAnnotationIsON = true;
+                               
+                //$("#btnZoom").addClass('disabled');
+                document.getElementById("btnZoom").setAttribute('disabled', 'disabled');
+                //$('#btnZoom').click(function (event) { event.preventDefault(); });
+
+                console.log('CTRL ON')
             }
             else {
                 if (($rootScope.previousHighlightList != null || $rootScope.previousHighlightList != undefined) && ($rootScope.previousHighlightList.length > 0)) {
                     $rootScope.previousHighlightList = [];
                 }
                 $rootScope.multiAnnotationIsON = false;
+
+                console.log('multiAnnotationIsON: ' + $rootScope.multiAnnotationIsON);
+              //  document.getElementById("btnZoom").setAttribute('enabled', 'enabled');
+
+                document.getElementById("btnZoom").disabled = false;
             }
 
             var annotationText;
@@ -1917,9 +1932,6 @@ function ($scope, $rootScope, $compile, $http, $log, $location, $timeout, DA, Mo
 
                 }
                 else {
-
-
-
                     $scope.MultiLanguageAnnationArray = [];
                     $scope.MultiLanguageAnnationArray.push(annotationText);
 
@@ -6910,12 +6922,8 @@ function ($scope, $rootScope, $compile, $http, $log, $location, $timeout, DA, Mo
         $rootScope.CloseAnnotationTool();
     }
 
-
     //clsoe worker process
     $scope.$on('jsPanelCloseEvent', function (event, data) {
-
-
-
         console.log('terminate worker process')
         //terminate previous running workers to create space for new workers
         $scope.terminateCurrentlyRunningWPs();