--- a/betweenpoint.submit.php
+++ b/betweenpoint.submit.php
@@ -5,7 +5,7 @@
   exit;
 }
 print_r($_REQUEST);
-$reverse=$_REQUEST["reverse"];
+$reverse=(isset($_REQUEST["reverse"]) ? $_REQUEST["reverse"] : "off");
 $from=pg_escape_string($_REQUEST["from"]);
 $to=pg_escape_string($_REQUEST["to"]);
 $routes=$_REQUEST["routes"] ;