Index: frontends/php/chart2.php
===================================================================
--- frontends/php/chart2.php	(revision 31645)
+++ frontends/php/chart2.php	(working copy)
@@ -100,6 +100,8 @@
 $width = get_request('width', 0);
 if ($width <= 0) {
 	$width = $dbGraph['width'];
+} elseif ($width > 800) {
+	$width = 800;
 }
 
 $height = get_request('height', 0);