Index: modules/image/image.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/image/image.module,v
retrieving revision 1.54
diff -u -p -r1.54 image.module
--- modules/image/image.module	18 Nov 2010 05:36:27 -0000	1.54
+++ modules/image/image.module	9 Dec 2010 14:11:36 -0000
@@ -787,6 +787,17 @@ function image_style_flush($style) {
 }
 
 /**
+ * Flush cached media for all styles.
+ */
+
+function image_all_styles_flush() {
+  $styles = image_styles() ;
+  foreach ($styles as $style) {
+   image_style_flush($style);
+  }
+}
+
+/**
  * Return the URL for an image derivative given a style and image path.
  *
  * @param $style_name