Index: image_helper.php
===================================================================
--- image_helper.php	(revision 13241)
+++ image_helper.php	(working copy)
@@ -62,13 +62,13 @@
 		 * @param mixed $max_height maximal allowed resized image height or false if no limit
 		 * @return string direct url to resized image
 		 */
-		function ResizeImage($src_image, $max_width, $max_height = null)
+		function ResizeImage($src_image, $max_width, $max_height = false)
 		{
 			$image_size = false;
 
-			if(isset($max_height)) {
+			if (is_numeric($max_width)) {
+				$params['max_width'] = $max_width;
 				$params['max_height'] = $max_height;
-				$params['max_width'] = $max_width;
 			}
 			else {
 				$params = $this->parseFormat($max_width);