var centerLatitude = 51.587776372686974;
var centerLongitude = -0.21350383758544922; 
var startZoom = 15;
var currZoom = startZoom;
var markersArray = new Array();
var map;

function init()
{
   if (GBrowserIsCompatible()) 
   {
      map = new GMap2(document.getElementById("map"));
      map.addControl(new GLargeMapControl());
      
      var location = new GLatLng(centerLatitude, centerLongitude);
      map.setCenter(location, startZoom);
      
      var marker = new GMarker(location);
      map.addOverlay(marker);
    }
}

window.onload = init;
window.onunload = GUnload;