text: var layer = new ol.layer.Tile({
    source: new ol.source.OSM()
  });
  
  var map = new ol.Map({
    layers: [layer],
    target: 'map',
    view: new ol.View({
      center: [0, 0],
      zoom: 2
    })
  });
  
  var pos = ol.proj.fromLonLat([16.3725, 48.208889]);
  
  // Vienna marker
  var marker = new ol.Overlay({
    position: pos,
    positioning: 'center-center',
    element: document.getElementById('marker'),
    stopEvent: false
  });
  map.addOverlay(marker);
  
  // Vienna label
  var vienna = new ol.Overlay({
    position: pos,
    element: document.getElementById('vienna')
  });
  map.addOverlay(vienna);
  
  // Popup showing the position the user clicked
  var popup = new ol.Overlay({
    element: document.getElementById('popup')
  });
  map.addOverlay(popup);
  
  map.on('click', function(evt) {
    var element = popup.getElement();
    var coordinate = evt.coordinate;
    var hdms = ol.coordinate.toStringHDMS(ol.proj.transform(
        coordinate, 'EPSG:3857', 'EPSG:4326'));
  
    $(element).popover('destroy');
    popup.setPosition(coordinate);
    // the keys are quoted to prevent renaming in ADVANCED mode.
    $(element).popover({
      'placement': 'top',
      'animation': false,
      'html': true,
      'content': '<p>The location you clicked was:</p><code>' + hdms + '</code>'
    });
    $(element).popover('show');
  });
  