Want to get region name from drill down map of jvectormap

I am unable to get region name from code of region. My region click event work fine and I also get code properly. My code is:

<div id="map" style="width: 600px; height: 400px"></div>
<script type="text/javascript">
    $(function () {
        new jvm.MultiMap({
            container: $('#map'),
            maxLevel: 1,
            main: {
                map: 'us_lcc_en'
            },
            mapUrlByCode: function (code, multiMap) {
                return 'js/counties/jquery-jvectormap-data-' +
                   code.toLowerCase() + '-' +
                   multiMap.defaultProjection + '-en.js';
            }
        });


        $('#map').bind('regionClick.jvectormap', function (event, code) {
            var map = $('#map').vectorMap('get', 'mapObject');
            alert(map.getRegionName(code));
        });
    });
</script>

Add this code

onRegionClick:function(event, code) {                        
        var name = (code);                        
        alert(name);                    
        }

All Script Like This

 <div id="map" style="width: 600px; height: 400px"></div>
<script type="text/javascript">
    $(function () {
        new jvm.MultiMap({
            container: $('#map'),
            maxLevel: 1,
            main: {
                map: 'us_lcc_en'
            },
            mapUrlByCode: function (code, multiMap) {
                return 'js/counties/jquery-jvectormap-data-' +
                   code.toLowerCase() + '-' +
                   multiMap.defaultProjection + '-en.js';
            }
        });


     onRegionClick:function(event, code) {                        
        var name = (code);                        
        alert(name);                    
        }
    });
</script>