var map;
    var markers = new Array(1);
    function onLoad() {
      map = new GMap2(document.getElementById("map"));
      map.setCenter(new GLatLng(34.80711739449073,138.26459169387817),12);
      map.addControl(new GLargeMapControl());
      map.addControl(new GMapTypeControl());
      map.addControl(new GOverviewMapControl());
      map.setMapType(G_NORMAL_MAP);
      var marker = null;
      var n_markers = 0;
      var markeropts = new Object();
      markeropts.title = "丸山歯科";
      marker = new GMarker(new GPoint(138.26437711715698,34.80693240077748), markeropts);
      markers[n_markers] = marker;
      GEvent.addListener(markers[0], "mouseover", function () {markers[0].openInfoWindowHtml("丸山歯科医院<br><img src=\"/clinic/image/map.jpg\">");});
	  	map.openInfoWindowHtml(map.getCenter(),
             "丸山歯科医院<br><img src=\"/clinic/image/map.jpg\">");
      n_markers++;
      map.addOverlay(marker);
    }