diff -ru3 openbox-3.2-vanilla/openbox/client.c openbox-3.2-tr1/openbox/client.c
--- openbox-3.2-vanilla/openbox/client.c	2004-03-31 09:40:06.000000000 +0200
+++ openbox-3.2-tr1/openbox/client.c	2004-09-13 16:41:07.000000000 +0200
@@ -79,7 +79,14 @@
 
 void client_startup(gboolean reconfig)
 {
-    if (reconfig) return;
+    if (reconfig)
+    {
+        GList *it;
+        for (it = client_list; it; it = g_list_next(it))
+            client_set_opacity(it->data,
+                               (it->data == focus_client) ? config_opacity_focus : config_opacity_nofocus);
+        return;
+    }
 
     client_set_list();
 }
@@ -389,6 +396,10 @@
     /* this has to happen after we're in the client_list */
     screen_update_areas();
 
+    /* Update opacity */
+    client_set_opacity(self,
+                       (focus_client == self) ? config_opacity_focus : config_opacity_nofocus);
+
     /* update the list hints */
     client_set_list();
 
@@ -3330,3 +3341,10 @@
 {
     return self->group && self->group->members->next;
 }
+
+void client_set_opacity(ObClient *self, guint opacity)
+{
+    if(self->frame && self->frame->window != None)
+      PROP_SET32(self->frame->window, net_wm_window_opacity, cardinal, 
+                 (double)0xffffffff * opacity / 100.0);
+}
diff -ru3 openbox-3.2-vanilla/openbox/client.h openbox-3.2-tr1/openbox/client.h
--- openbox-3.2-vanilla/openbox/client.h	2004-03-21 02:03:00.000000000 +0100
+++ openbox-3.2-tr1/openbox/client.h	2004-09-13 16:15:42.000000000 +0200
@@ -565,4 +565,6 @@
 
 gboolean client_has_group_siblings(ObClient *self);
 
+void client_set_opacity(ObClient *self, guint opacity);
+
 #endif
diff -ru3 openbox-3.2-vanilla/openbox/config.c openbox-3.2-tr1/openbox/config.c
--- openbox-3.2-vanilla/openbox/config.c	2004-04-17 14:12:49.000000000 +0200
+++ openbox-3.2-tr1/openbox/config.c	2004-09-13 16:04:03.000000000 +0200
@@ -73,6 +73,9 @@
 gint config_resist_win;
 gint config_resist_edge;
 
+guint config_opacity_focus;
+guint config_opacity_nofocus;
+
 /*
 
 <keybind key="C-x">
@@ -219,6 +222,19 @@
         config_focus_last = parse_bool(doc, n);
 }
 
+static void parse_opacity(ObParseInst *i, xmlDocPtr doc, xmlNodePtr node,
+                        gpointer d)
+{
+    xmlNodePtr n;
+
+    node = node->children;
+    
+    if ((n = parse_find_node("focus", node)))
+        config_opacity_focus = parse_int(doc, n);
+    if ((n = parse_find_node("nofocus", node)))
+        config_opacity_nofocus = parse_int(doc, n);
+}
+
 static void parse_placement(ObParseInst *i, xmlDocPtr doc, xmlNodePtr node,
                             gpointer d)
 {
@@ -570,7 +586,7 @@
     config_dock_hide_delay = 300;
     config_dock_app_move_button = 2; /* middle */
     config_dock_app_move_modifiers = 0;
-
+    
     parse_register(i, "dock", parse_dock, NULL);
 
     translate_key("C-g", &config_keyboard_reset_state,
@@ -599,6 +615,11 @@
     config_menu_files = NULL;
 
     parse_register(i, "menu", parse_menu, NULL);
+
+    config_opacity_focus = 80;
+    config_opacity_nofocus = 50;
+    
+    parse_register(i, "opacity", parse_opacity, NULL);
 }
 
 void config_shutdown()
diff -ru3 openbox-3.2-vanilla/openbox/config.h openbox-3.2-tr1/openbox/config.h
--- openbox-3.2-vanilla/openbox/config.h	2004-03-21 21:06:40.000000000 +0100
+++ openbox-3.2-tr1/openbox/config.h	2004-09-13 15:55:31.000000000 +0200
@@ -116,6 +116,9 @@
 /*! User-specified menu files */
 extern GSList *config_menu_files;
 
+extern guint config_opacity_focus;
+extern guint config_opacity_nofocus;
+
 void config_startup(struct _ObParseInst *i);
 void config_shutdown();
 
diff -ru3 openbox-3.2-vanilla/openbox/focus.c openbox-3.2-tr1/openbox/focus.c
--- openbox-3.2-vanilla/openbox/focus.c	2004-03-31 11:56:01.000000000 +0200
+++ openbox-3.2-tr1/openbox/focus.c	2004-09-13 16:22:15.000000000 +0200
@@ -193,10 +193,13 @@
     /* in the middle of cycling..? kill it. */
     if (focus_cycle_target)
         focus_cycle(TRUE, TRUE, TRUE, TRUE, TRUE);
-
+    
+    if(focus_client)
+        client_set_opacity(focus_client, config_opacity_nofocus);
+    
     old = focus_client;
     focus_client = client;
-
+    
     /* move to the top of the list */
     if (client != NULL)
         push_to_top(client);
@@ -206,6 +209,8 @@
         active = client ? client->window : None;
         PROP_SET32(RootWindow(ob_display, ob_screen),
                    net_active_window, window, active);
+        if(client)
+            client_set_opacity(client, config_opacity_focus);
     }
 }
 
diff -ru3 openbox-3.2-vanilla/openbox/prop.c openbox-3.2-tr1/openbox/prop.c
--- openbox-3.2-vanilla/openbox/prop.c	2004-03-21 02:03:00.000000000 +0100
+++ openbox-3.2-tr1/openbox/prop.c	2004-09-13 14:24:14.000000000 +0200
@@ -151,6 +151,8 @@
 
     CREATE(openbox_pid, "_OPENBOX_PID");
     CREATE(ob_wm_state_undecorated, "_OB_WM_STATE_UNDECORATED");
+    
+    CREATE(net_wm_window_opacity, "_NET_WM_WINDOW_OPACITY");
 }
 
 #include <X11/Xutil.h>
diff -ru3 openbox-3.2-vanilla/openbox/prop.h openbox-3.2-tr1/openbox/prop.h
--- openbox-3.2-vanilla/openbox/prop.h	2004-03-21 02:03:00.000000000 +0100
+++ openbox-3.2-tr1/openbox/prop.h	2004-09-13 14:21:46.000000000 +0200
@@ -164,6 +164,10 @@
      
     Atom openbox_pid;
     Atom ob_wm_state_undecorated;
+    
+    /* xcompmgr opacity hint */
+    Atom net_wm_window_opacity;
+    
 } Atoms;
 Atoms prop_atoms;