title: OpenLayers.js which files to use?
body: <p>As i red from the <code>readme</code> file, <code>openlayers.js</code> has multiple choices for including files and themes.</p>
  
  <p>What i would like is to use the <code>lightest solution of openlayers.js</code> files.</p>
  
  <p>I included the <code>openlayers.light.js</code> in my app, and it creates maps but do not show them, check this:</p>
  
  <p><img src="https://i.stack.imgur.com/VqY9F.png" alt="enter image description here"></p>
  
  <p>do i forgot to include some other file?</p>
  
  <p>my structure structure is this:</p>
  
  <pre><code>/vendor
     /js
       openlayers.light.js
       /img
       /theme
  </code></pre>
  
  <p>how to show maps layers?</p>
  
  <p>Also does the <code>openlayers.light.js</code> will work on mobile devices (once fixed this problem :P )? or i'll need to include <code>openlayers.mobile.js</code> too?</p>
  
  <p>This is the code not working with openlayers.light.js but working with openlayers.js (740kb) :</p>
  
  <pre><code>var _element = "#map";
   var map = new OpenLayers.Map (_element, {
      controls: [
      new OpenLayers.Control.Navigation({
        dragPanOptions: {
          enableKinetic: true
        }
      }),
      new OpenLayers.Control.Zoom()
      ],
      projection: new OpenLayers.Projection("EPSG:900913"),
      displayProjection: new OpenLayers.Projection("EPSG:4326")
    });
  
    var lonLat = new OpenLayers.LonLat(_lon, _lat).transform (
  new OpenLayers.Projection("EPSG:4326"), // transform from WGS 1984
  new OpenLayers.Projection("EPSG:900913") // to Spherical Mercator Projection
  // map.getProjectionObject() doesn't work for unknown reason
  );
    var markers = new OpenLayers.Layer.Markers( "Markers" );
    map.addLayer(markers);
  
    var size = new OpenLayers.Size(21,25);
    var offset = new OpenLayers.Pixel(-(size.w/2), -size.h);
    var icon = new OpenLayers.Icon(_img_map_marker, size, offset);
    markers.addMarker(new OpenLayers.Marker(lonLat, icon.clone()));
  
    var mapnik = new OpenLayers.Layer.OSM("Test");
    map.addLayer(mapnik);
  
    map.setCenter (lonLat,3);
  </code></pre>
  
  <p><strong>PS: my openlayers map js init method is ok, it works using the huge <code>openlayers.js (740KB)</code>, but not working with openlayers.light.js as i showed above</strong></p>
  
  <p>html</p>
  
  <pre><code>&lt;div id="map"&gt;&lt;/div&gt;
  </code></pre>
  
  <p>css</p>
  
  <pre><code>img{max-width:none;}
  #map{
  width:300px;
  height:300px;
  }
  </code></pre>