Update HowToVisitPSS.md

HowToVisitPSS.md

- <script src="http://www.openlayers.org/api/OpenLayers.js"></script>
-															  <script>
-															    map = new OpenLayers.Map("mapdiv");
+ <script src="http://www.openlayers.org/api/OpenLayers.js">
+ </script>
+<script>
+map = new OpenLayers.Map("mapdiv");
 															    map.addLayer(new OpenLayers.Layer.OSM());
 
 															    var lonLat = new OpenLayers.LonLat( 2.37995 ,48.82754 )
@@ -17,4 +18,4 @@
 															    markers.addMarker(new OpenLayers.Marker(lonLat));
 
 															    map.setCenter (lonLat, zoom);
-															  </script>
+</script>