Google マップ API .
ルート ドキュメントの例:
// Create a directions object and register a map and DIV to hold the
// resulting computed directions
var map;
var directionsPanel;
var directions;
function initialize() {
map = new GMap2(document.getElementById("map_canvas"));
directionsPanel = document.getElementById("my_textual_div");
map.setCenter(new GLatLng(49.496675,-102.65625), 3);
directions = new GDirections(map, directionsPanel);
directions.load("from: 500 Memorial Drive, Cambridge, MA to: 4 Yawkey Way, Boston, MA 02215 (Fenway Park)");
}