map.on('click', function(evt){

            coordinate = evt.coordinate;
            overlay.setPosition(coordinate);

            var v= (document.getElementById('bild-switch_2').checked)? 45 -  coordinate[0] : coordinate[0];

            content.innerHTML = '<p>You clicked here:</p></br><code>x: ' +v.toFixed(2) +' m</code></br><code>y: '+ coordinate[1].toFixed(2) + ' m</code>';

            container.style.display = 'block';  

    });