diff --git a/html/includes/graphs/graph.inc.php b/html/includes/graphs/graph.inc.php
index f7c4ec916..05e140c40 100644
--- a/html/includes/graphs/graph.inc.php
+++ b/html/includes/graphs/graph.inc.php
@@ -1,7 +1,5 @@
 <?php
 
-$from     = mres($_GET['from']);
-$to       = mres($_GET['to']);
 $width    = mres($_GET['width']);
 $height   = mres($_GET['height']);
 $title    = mres($_GET['title']);
@@ -9,6 +7,11 @@ $vertical = mres($_GET['vertical']);
 $legend   = mres($_GET['legend']);
 $id       = mres($_GET['id']);
 
+$from     = (isset($_GET['from']) ? mres($_GET['from']) : time() - 60*60*24);
+$to       = (isset($_GET['to']) ? mres($_GET['to']) : time());
+
+if ($from < 0) { $from = $to + $from; }
+
 $graphfile = $config['temp_dir'] . "/"  . strgen() . ".png";
 
 preg_match('/^(?P<type>[A-Za-z0-9]+)_(?P<subtype>.+)/', mres($_GET['type']), $graphtype);