function getBoundsZoomLevel(bounds, mapDim) {
    var WORLD_DIM = { height: 256, width: 256 };
    var ZOOM_MAX = 21;

    function latRad(lat) {
        var sin = Math.sin(lat * Math.PI / 180);
        var radX2 = Math.log((1 + sin) / (1 - sin)) / 2;
        return Math.max(Math.min(radX2, Math.PI), -Math.PI) / 2;
    }

    function zoom(mapPx, worldPx, fraction) {
        return Math.floor(Math.log(mapPx / worldPx / fraction) / Math.LN2);
    }

    var ne = bounds.getNorthEast();
    var sw = bounds.getSouthWest();

    var latFraction = (latRad(ne.lat()) - latRad(sw.lat())) / Math.PI;

    var lngDiff = (ne.lng() - sw.lng())%360;
    var lngFraction = lngDiff / 360;

    var latZoom = zoom(mapDim.height, WORLD_DIM.height, latFraction);
    var lngZoom = zoom(mapDim.width, WORLD_DIM.width, lngFraction);

    return Math.min(latZoom, lngZoom, ZOOM_MAX);
}
function initialize_itinerary(){

	var map = new google.maps.Map(document.getElementById('day-itinerary-canvas'),{
			zoom: 1,
        	        center: new google.maps.LatLng(-1,-1),
        	        mapTypeId: google.maps.MapTypeId.ROADMAP
                });

	var mapDiv = $('#day-itinerary-canvas');
	var mapDim = { height: mapDiv.height(), width: mapDiv.width() };

	var sw = new google.maps.LatLng(-1, -1);
        var ne = new google.maps.LatLng(-1, -1);

        var zoom = getBoundsZoomLevel(new google.maps.LatLngBounds(sw,ne), mapDim);
        map.setZoom(zoom);
	} google.maps.event.addDomListener(window, 'load', initialize_itinerary);