document.getElementById('google').onclick = function() { center = map.getCenter(); center.transform(proj_3857, proj_4326); var lat1 = center.lat.toFixed(6); var lon1 = center.lon.toFixed(6); var zoom1 = map.getZoom().toFixed(); var url1 = param.url; var url2 = "googlemap.html?"+"lat="+lat1+"&lng="+lon1+"&zoom="+zoom1+"&url="+url1;