JS Norway Sat Resize Sat Radar Image Custom Height/Width SRC

<script>
var w=prompt("Enter Width Size:");
var h=prompt("Enter Height Size:");
document.write('<img style="-webkit-user-select: none; cursor: zoom-in;" src="http://api.met.no/weatherapi/radar/1.5/?radarsite=central_norway;type=reflectivity;content=animation;size=large" width="'+w+'" height="'+h+'"></body></html>');
</script>