function initialize() {
        var centerPos = new google.maps.LatLng(35.729792,139.706944);
        var dispPos   = new google.maps.LatLng(35.729369,139.707357);
        var mapOptions = {
          zoom : 18,
          center : dispPos,
          mapTypeId: google.maps.MapTypeId.ROADMAP
        };
		
        var map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
		
		var markerOptions = {
  		position : centerPos,
		map : map,
		icon : "img/maplogo.png"
		};
		
		var marker = new google.maps.Marker(markerOptions);
		
      }