diff -u dwm-5.7.2/dwm.c dwm-5.7.2-focus/dwm.c
--- dwm-5.7.2/dwm.c	2009-09-27 23:20:23.000000000 +0400
+++ dwm-5.7.2-focus/dwm.c	2009-10-09 19:55:19.000000000 +0400
@@ -57,7 +57,7 @@
 /* enums */
 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
-enum { NetSupported, NetWMName, NetLast };              /* EWMH atoms */
+enum { NetSupported, NetWMName, NetActiveWindow, NetLast };              /* EWMH atoms */
 enum { WMProtocols, WMDelete, WMState, WMLast };        /* default atoms */
 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
        ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
@@ -161,6 +161,7 @@
 static void cleanup(void);
 static void cleanupmon(Monitor *mon);
 static void clearurgent(Client *c);
+static void clientmessage(XEvent *e);
 static void configure(Client *c);
 static void configurenotify(XEvent *e);
 static void configurerequest(XEvent *e);
@@ -249,6 +250,7 @@
 static unsigned int numlockmask = 0;
 static void (*handler[LASTEvent]) (XEvent *) = {
 	[ButtonPress] = buttonpress,
+	[ClientMessage] = clientmessage,
 	[ConfigureRequest] = configurerequest,
 	[ConfigureNotify] = configurenotify,
 	[DestroyNotify] = destroynotify,
@@ -521,6 +523,22 @@
 }
 
 void
+clientmessage(XEvent *e) {
+	XClientMessageEvent *ev = &e->xclient;
+	Client *c;
+	Monitor *m;
+
+	if(ev->message_type == netatom[NetActiveWindow]) {
+	    if((m = wintomon(ev->window)) && m != selmon) {
+		    unfocus(selmon->sel);
+		    selmon = m;
+	    }
+	    if((c = wintoclient(ev->window)))
+		    focus(c);
+	}
+}
+
+void
 configure(Client *c) {
 	XConfigureEvent ce;
 
@@ -1493,6 +1511,7 @@
 	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
 	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
+	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
 	/* init cursors */
 	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);