Touch Screen - Marker Drag n Drop Issue

http://stackoverflow.com/questions/16098971/touch-screen-error-while-setting-draggable-property-of-google-map

HTML

<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>    

<div id="map_canvas" style="border: 1px solid black; width: 1000px; height: 500px;">
        map div

    </div>

JavaScript

var isAnyMarkerIsInDraggingState = false;
var mapCenterPositionAtTheTimeWhenMarkerWasDragged;

var initialLocation = new google.maps.LatLng(59.312608,18.070107);
    var mapOptions = {  zoom: 12,
      mapTypeId: google.maps.MapTypeId.ROADMAP,
      center: initialLocation
    };

    var mapObject = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
      
    google.maps.event.addListener(mapObject, 'dragstart', function () {
        // isAnyMarkerIsInDraggingState = true: means the user is dragging a marker.
        // If the user is dragging the Marker then don't allow the Map to be Dragged
        if (isAnyMarkerIsInDraggingState) {
            mapObject.setOptions({ draggable: false });
        }
    });
    google.maps.event.addListener(mapObject, 'drag', function () {
        // isAnyMarkerIsInDraggingState = true: means the user is dragging a marker.
        // If the user is dragging the Marker then don't allow the Map to be Dragged and set its CenterPosition
        // to mapCenterPositionAtTheTimeWhenMarkerWasDragged
  
        if (isAnyMarkerIsInDraggingState) {
            mapObject.setCenter(mapCenterPositionAtTheTimeWhenMarkerWasDragged);
        }
    });



    function dropMarker() {
        var objMarker = new google.maps.Marker({
            position: mapObject.getCenter(),
            map: mapObject,
            draggable: true,
            animation: google.maps.Animation.DROP
        });
         
        google.maps.event.addListener(objMarker, 'dragstart', function () {
            // Store map center position when a marker is dragged
            mapCenterPositionAtTheTimeWhenMarkerWasDragged = mapObject.getCenter();
            isAnyMarkerIsInDraggingState = true;
        });
    
        google.maps.event.addListener(objMarker, 'dragend', function () {
            // Make Map draggable
            // Set isAnyMarkerIsInDraggingState = false. Because no marker is in drag state
            mapObject.setOptions({...