var map;
var Loc1;

$('#mapPage').live('pageshow',
        function(event, ui) {
            var mapOptions = {
                zoom : 7,
                mapTypeId : google.maps.MapTypeId.ROADMAP,
                center : Loc1
            };

            map = new google.maps.Map(document.getElementById('map_canvas'),
                    mapOptions);
        });

function initialize(Hlat1, Hlng1, Hlat2, Hlng2) {
    Loc1 = new google.maps.LatLng(Hlat1, Hlng1);

    var $content = $("#mapPage div:jqmData(role=content)");
    $content.height(screen.height);
    $.mobile.changePage($("#mapPage"));

    calcRoute(Hlat1, Hlng1, Hlat2, Hlng2);
}

function calcRoute(Hlat1, Hlng1, Hlat2, Hlng2) {
    var rendererOptions = {
        draggable : true
    };
    var directionsDisplay = new google.maps.DirectionsRenderer(rendererOptions);
    var directionsService = new google.maps.DirectionsService();

    var request = {
        origin : new google.maps.LatLng(Hlat1, Hlng1),
        destination : new google.maps.LatLng(Hlat2, Hlng2),
        travelMode : google.maps.DirectionsTravelMode.DRIVING
    };

    directionsService.route(request, function(response, status) {
        if (status == google.maps.DirectionsStatus.OK) {
            directionsDisplay.setDirections(response);
            directionsDisplay.setMap(map);
        }
    });
}