google.maps.event.addListener(budowlana, 'click', function test112() {
infowindow25.open(map, budowlana);
});

var budowlana = new google.maps.Marker({
position: new google.maps.LatLng(-60.5, 75.0),
map: map,
title: 'Po najechaniu na maker',
clickable: true,
icon: 'ikony/ikokna1.png'
});

var contentString25 = "<b>jakis tam tekst okienka</b>";
var infowindow25 = new google.maps.InfoWindow({
content: contentString25
});
google.maps.event.addListener(budowlana, 'click', function() {
infowindow25.open(map, budowlana);
});

<dl id="menu0">
<dt>Nagłówek</dt>
<dd><a href="#" onClick="java script:infowindow25.open(map, budowlana);">Kliknij</a></dd>
</dl>