diff --git a/mozilla/modules/libimg/gifcom/gif.cpp b/mozilla/modules/libimg/gifcom/gif.cpp
index 090fb00ba6c..fcd8ca47b7c 100644
--- a/mozilla/modules/libimg/gifcom/gif.cpp
+++ b/mozilla/modules/libimg/gifcom/gif.cpp
@@ -116,7 +116,8 @@ typedef enum {
     gif_consume_netscape_extension,
     gif_consume_comment,
     gif_delay,
-    gif_wait_for_buffer_full
+    gif_wait_for_buffer_full,
+    gif_stop_animating   //added for animation stop 
 } gstate;
 
 /* "Disposal" method indicates how the image should be handled in the
@@ -1508,7 +1509,7 @@ il_gif_write(il_container *ic, const PRUint8 *buf, int32 len)
                     to stop decoding of subsequent frames. Only the
                     first frame is displayed for eImageAnimation_None.
                     */
-                    gs->state = gif_error;
+                    gs->state = gif_stop_animating;   
                     break;
                 }
 
@@ -1609,6 +1610,10 @@ il_gif_write(il_container *ic, const PRUint8 *buf, int32 len)
             return MK_IMAGE_LOSSAGE;
             break;
 
+        case gif_stop_animating:
+            return 0;
+            break;
+
         default: 
             ILTRACE(0,("il:gif: unknown state"));
             PR_ASSERT(0);