window.onload=function() {
  if( document.getElementById("map_canvas") )
    gmap();
}
function gmap() {
  var myLatlng = new google.maps.LatLng(54.674500,25.280850);
  var myLatlngCenter = new google.maps.LatLng(54.675200,25.281500);
  var myOptions = {
    zoom: 16,
    center: myLatlngCenter,
    mapTypeId: google.maps.MapTypeId.ROADMAP // SATELLITE HYBRID TERRAIN
  }

  var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);

  var contentString = '<div style="text-align:center"><img src="images/gmap-logo.gif" alt=""></div>';

  var infowindow = new google.maps.InfoWindow({
      content: contentString
  });

  var marker = new google.maps.Marker({
      position: myLatlng,
      map: map,
      visible: false,
      title:""
  });
  
  infowindow.open(map,marker);
}