OpenLayers Vector Marker

Confusingly it's better to use a Vector layer than the old Marker layer type, even if you wanted markers. Vector layers are more flexible

<html>
  <head><title>OpenLayers Vector Marker Example</title></head>
  <body>
  <div id="mapdiv"></div>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/openlayers/2.11/lib/OpenLayers.js"></script>
  <script>
    map = new OpenLayers.Map("mapdiv");
    map.addLayer(new OpenLayers.Layer.OSM());
    
    epsg4326 =  new OpenLayers.Projection("EPSG:4326"); //WGS 1984 projection
    projectTo = map.getProjectionObject(); //The map projection (Spherical Mercator)
   
    var lonLat = new OpenLayers.LonLat( -0.1279688, 51.5077286 ).transform(epsg4326, projectTo);
          
    var zoom=16;
    map.setCenter (lonLat, zoom);

//The vector layer
    var vectorLayer = new OpenLayers.Layer.Vector("Overlay");
    
    //Make the feature a plain OpenLayers marker
    var feature = new OpenLayers.Feature.Vector(
            new OpenLayers.Geometry.Point( -0.1279688, 51.5077286 ).transform(epsg4326, projectTo),
            {description:'This is the value of<br>the description attribute'} ,
            {externalGraphic: './img/marker.png', graphicHeight: 25, graphicWidth: 21, graphicXOffset:-12, graphicYOffset:-25  }
        );
 
    vectorLayer.addFeatures(feature);

map.addLayer(vectorLayer);
 
  </script>
  
</body></html>

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Harry Wood

OpenLayers Vector Marker