if (GBrowserIsCompatible()) {
var cyclingmap = new GMap2(document.getElementById("map"));
var markerIcon1 = new GIcon();
markerIcon1.image = "http://cycling.ashika.jp/common/img/icon/icon_cource_sounkyo.png";
var markerIcon2 = new GIcon();
markerIcon2.image = "http://cycling.ashika.jp/common/img/icon/icon_cource_nagayama.png";
var opt1 = {icon:markerIcon1};
var opt2 = {icon:markerIcon2};
var marker1 = new GMarker(new GLatLng(43.808641,142.503069), opt1);
var marker2 = new GMarker(new GLatLng(43.811367,142.559545), opt2);
cyclingmap.addOverlay(marker1);
cyclingmap.addOverlay(marker2);
  }