Index: branches/5.1.x/core/units/helpers/image_helper.php
===================================================================
diff -u -N -r13086 -r13545
--- branches/5.1.x/core/units/helpers/image_helper.php	(.../image_helper.php)	(revision 13086)
+++ branches/5.1.x/core/units/helpers/image_helper.php	(.../image_helper.php)	(revision 13545)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: image_helper.php 13086 2010-01-12 19:47:40Z alex $
+* @version	$Id: image_helper.php 13545 2010-05-11 19:19:58Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -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)) {
-				$params['max_height'] = $max_height;
+			if (is_numeric($max_width)) {
 				$params['max_width'] = $max_width;
+				$params['max_height'] = $max_height;
 			}
 			else {
 				$params = $this->parseFormat($max_width);
@@ -194,7 +194,11 @@
 					// 3. apply watermark
 					$dst_image_rs =& $this->_applyWatermark($dst_image_rs, $params[$watermark_size . '_width'], $params[$watermark_size . '_height'], $params);
 
-					return @$write_function($dst_image_rs, $params['dst_image'], 100);
+					if ($write_function == 'imagegif') {
+						return @$write_function($dst_image_rs, $params['dst_image']);
+					}
+
+					return @$write_function($dst_image_rs, $params['dst_image'], $write_function == 'imagepng' ? 0 : 100);
 				}
 			}
 			else {