InitializeMap without Overlay

var coordinates = new google.maps.LatLng(51.249063053858244, 22.56991982460022);
    var mapOptions = {
      zoom: 16,
      center: coordinates,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    };

    mymap = new google.maps.Map(document.getElementById("map"), opcjeMapy);
    var marker = addMarker(51.2495062791539, 22.56988227367401,'<a href="http://wikipedia.org" id="2">sample</a>');
    google.maps.event.trigger(marker,'click');

    function addMarker(lat,lng,txt)
    {
        var info = new google.maps.InfoWindow();

        var markerOptions =
        {
            position: new google.maps.LatLng(lat,lng),
            map: mymap
        }
        var marker = new google.maps.Marker(markerOptions);
        marker.txt=txt;

        google.maps.event.addListener(marker,"click",function()
        {
            info.setContent(marker.txt);
            info.open(map,marker);
        });
        return marker;
    }