          var BW0000000icon = document.getElementById('BW0000000icon');         var BW0000000marker = new ol.Overlay({             positioning: 'center-center',             offset: [0, 0],             element: BW0000000icon,             stopEvent: false         });         map.addOverlay(BW0000000marker);          var BW0000000icon = document.getElementById('BW0000000icon');         var BW0000000marker = new ol.Overlay({             positioning: 'center-center',             offset: [0, 0],             element: BW0000000icon,             stopEvent: false         });         map.addOverlay(BW0000000marker);          var 