JS Lat Lon Fin SRC

​<script>
var l1=prompt("Enter Lat:");
var l2=prompt("Enter Lon:");
var l3=prompt("Enter Lat Dest:");
var l4=prompt("Enter Lon Dest:");
document.writeln("<iframe src=https://www.timeanddate.com/scripts/showmap.php?la1="+l1+"&lo1="+l2+"&la2="+l3+"&lo2="+l4+">");
</script>