var g_map = new GMap(document.getElementById("map"));
g_map.addControl(new GLargeMapControl());
g_map.centerAndZoom(new GPoint(138.923095,36.502013),5);

function buildInfoHtml(no){
	return document.getElementById('list' + no).innerHTML;
}
function buildGMarker(lng, lat){return new GMarker(new GPoint(lng, lat));}

addGMarker(1,139.013658,36.482174);
addGMarker(2,138.995762,36.492336);
addGMarker(3,138.923932,36.499745);
addGMarker(4,138.922902,36.501849);

function addGMarker(marker_no, lng, lat){
	var marker = buildGMarker(lng, lat);
	var function_value = function(){
		g_map.centerAtLatLng(new GPoint(lng,lat));
		marker.openInfoWindowHtml(buildInfoHtml(marker_no));
	};
	GEvent.addListener(marker, 'click', function_value);
	var marker_field = document.getElementById('link'+ marker_no);
	if(marker_field){
		marker_field.onmousedown = function_value;
	}
	g_map.addOverlay(marker);
}