title: Marker with label does not appear
body: <p>I want to attach labels to my markers, using the markerwithlabel.js package (<a href="http://google-maps-utility-library-v3.googlecode.com/svn/tags/markerwithlabel/1.1.9/" rel="nofollow">http://google-maps-utility-library-v3.googlecode.com/svn/tags/markerwithlabel/1.1.9/</a>). I put the package link in the document header, and added the label properties in my addMarker function. I have no idea why the labels do not appear, since before I added the label properties everything worked. Am I missing something?</p>
  
  <p>In the header:</p>
  
  <pre><code>        &lt;script src="http://google-maps-utility-library-v3.googlecode.com/svn/tags/markerwithlabel/1.1.9/src/markerwithlabel.js" type="text/javascript"&gt;&lt;/script&gt;
  </code></pre>
  
  <p>Here I create the markers:</p>
  
  <pre><code>//iterate through marker data and assign values to variables
              for (i = 0; i &lt; markerData.length; i++) {
                  var pos = new google.maps.LatLng(markerData[i][1], markerData[i][2]);
                  var title = markerData[i][0];
                  var category = markerData[i][3];
                  var new_marker = addMarker(pos, title, category);
                  arrMarkers.push(new_marker);
                  new_marker.setVisible(false);
              }
  
              //create marker based on the variables
              function addMarker (pos, title, category) {
                  var marker = new google.maps.MarkerWithLabel({
                      map: map,
                      position: pos,
                      icon: "mapIcons/marker_"+markerData[i][4]+".png",
                      category: category,
                      labelContent: "test",
                      labelAnchor: new google.maps.Point(22, 0),
                      labelClass: "labels", // the CSS class for the label
                      labelStyle: {opacity: 0.75},
  
  
                  });  
  
                  infoBubble = new InfoBubble({
                      maxWidth: 300,
                      borderRadius: 10,
                      borderWidth: 1,
                      borderColor: '#2c2c2c',
                      shadowStyle: 1
                  });
  
                  var infoWindow = new google.maps.InfoWindow; 
                  var info = 'Functie: ' + '&lt;b&gt;' + markerData[i][0] + "&lt;/b&gt;" + '&lt;br&gt;' + 'Eigenschappen: ' + '&lt;b&gt;' + markerData[i][6] + "&lt;/b&gt;" ;  //html inside InfoWindow 
                  //var video = "&lt;div&gt;" + '&lt;iframe width="420" height="315" src="//www.youtube.com/embed/4gMH0V4L4A4"&gt;' + '&lt;/iframe&gt;' + "&lt;/div&gt;";  //html inside InfoWindow
                  var video = '&lt;iframe title="YouTube video player" class="youtube-player" type="text/html" width="250" height="188" src="http://www.youtube.com/embed/UmFjNiiVk9w?rel=0" frameborder="0"&gt;&lt;/iframe&gt;';
                  //var video = '&lt;iframe title="YouTube video player" class="youtube-player" type="text/html" width="200" height="180" src="//www.youtube.com/embed/4gMH0V4L4A4?rel=0" frameborder="0"&gt;&lt;/iframe&gt;'
                  //var video = '&lt;iframe width="420" height="315" src="//www.youtube.com/embed/S_9CSFeO9sM?rel=0" frameborder="0" allowfullscreen&gt;&lt;/iframe&gt;'
                  var media = "&lt;b&gt;" + 'Laatste foto, ontvangen op 15:33 9-7-2013' + "&lt;/b&gt;" + '&lt;img src="others/schiphol_marechaussee.jpg" alt="laatste foto"&gt;'  ;  //html inside InfoWindow 
                  var contact = ' &lt;form&gt;&lt;textarea rows="10" cols="30"&gt;Typ hier je bericht&lt;/textarea&gt;' + '&lt;input type="reset" value="Verstuur"&gt;&lt;/form&gt;';  //html inside InfoWindow 
  
  
                  if (markerData[i][5] == 'info') {
                      bindInfoWindowInfo(marker, map, infoBubble, info);
                      infoBubble.addTab('Info', info);
                      infoBubble.addTab('Contact', contact);
                      infoBubble.addTab('Media', media);
                  };
                  if (markerData[i][5] == 'video') {
                      bindInfoWindowVideo(marker, map, infoBubble, video); 
                      infoBubble.addTab('Video', video);
                  };
  
  
                  return marker;
              }
  </code></pre>
  
  <p>Upon clicking a checkbox, the markers appear (that's why its setVisible is false).</p>