<script>
 //
 // Function to get form values
 //
 function getInputVal( input ) {
  return document.getElementById( input ).value;
 }

 //
 // Delete a user (delete is a reserved word).
 //
 function deleteUser( ) {
  var ID = getInputVal( 'ID' );
  var userRef = firebase.database( ).ref( 'users/' + ID );
  userRef.remove( );
  var out  = "User # " + ID + " deleted";
  document.getElementById( 'result' ).innerHTML = out;
  return( false );
 }

 //
 // Delete the database users (delete is a reserved word).
 //
 function deleteDB( ) {
  var userRef = firebase.database( ).ref( 'users/' );
  userRef.remove( );
  var out = "Database users deleted";
  document.getElementById( 'result' ).innerHTML = out;
  return( false );
 }
</script>