--- mngplay.old/mngplay.c
+++ mngplay/mngplay.c
@@ -382,12 +382,19 @@
 	mngstuff	*mymng;
 	mng_handle	mng;
 	SDL_Rect	updaterect;
+    char *cp;
+    int ii;
 
 	if (argc < 2) {
 		const SDL_version *pSDLver = SDL_Linked_Version();
 
-		fprintf(stderr, "Usage:  %s mngfile [depth]\n\n", basename(argv[0]));
-		fprintf(stderr, "        where 'depth' is 15,16,24 or 32\n");
+        fprintf (stderr,
+            "Usage:  %s foo.mng [depth] [-window=ID#]\n\n",
+            basename (argv [0]));
+        fprintf (stderr, "depth can be 15, 16, 24 or 32\n");
+        fprintf (stderr, "-window=ID# specifies an X window ID");
+        fprintf (stderr, " [useful for MozPlugger purposes]");
+
 		fprintf(stderr,
 			"  Compiled with SDL %d.%d.%d; using SDL %d.%d.%d.\n",
 			SDL_MAJOR_VERSION, SDL_MINOR_VERSION, SDL_PATCHLEVEL,
@@ -425,23 +432,38 @@
 
 	/* pass the name of the file we want to play */
 	mymng->filename = argv[1];
+    mymng->sdl_video_depth = DEFAULT_SDL_VIDEO_DEPTH;
 
-	/* pass the color depth we wish to use */
-	if (argc>=3) {
-		mymng->sdl_video_depth = atoi(argv[2]);
-		switch(mymng->sdl_video_depth) {
-			case 15:
-			case 16:
-			case 24:
-			case 32:
-				break;
-			default:
-				fprintf(stderr, "Unsupported color depth. Choices are: 15, 16, 24 and 32\n");
-				exit(1);
-		}
-	}
-	else {
-		mymng->sdl_video_depth = DEFAULT_SDL_VIDEO_DEPTH;
+	for (ii = 2; ii+1 <= argc; ii++)
+	{
+        if (!strncmp (argv [ii], "-window=", 8))
+        {               /* process window-id option */
+            static char widbuf [64];
+            cp = argv [ii] + 8;
+
+            if (strlen (cp) < 32)
+            {
+                sprintf (widbuf, "SDL_WINDOWID=%s", cp);
+                putenv (widbuf);
+            }
+        }
+        else
+        {               /* process color-depth option */
+            mymng->sdl_video_depth = atoi (argv [ii]);
+
+            switch (mymng->sdl_video_depth)
+            {
+        case 15:
+        case 16:
+        case 24:
+        case 32:
+                break;
+        default:
+                fprintf (stderr,
+"Unsupported color depth. Choices are: 15, 16, 24 and 32\n");
+                exit (1);
+            }
+        }
 	}
 
 	/* set up the mng decoder for our stream */