if('[+OSGridRef+]')
    {
    marker = new GMarker([[OSGB_SE? &OSGBgridref=`[+OSGridRef+]`]]); /* [+id+] */
    marker.bindInfoWindowHtml('<a href="[~[+id+]~]">[+pagetitle+]</a>');
    map.addOverlay(marker);
    }