diff -r 17545de77bcb dwm.h
--- a/dwm.h	Sun Jul 22 16:45:45 2007 +0200
+++ b/dwm.h	Sun Jul 22 16:50:54 2007 +0200
@@ -144,6 +144,7 @@ void toggletag(const char *arg);	/* togg
 void toggletag(const char *arg);	/* toggles sel tags with arg's index */
 void toggleview(const char *arg);	/* toggles the tag with arg's index (in)visible */
 void view(const char *arg);		/* views the tag with arg's index */
+void selecttag(const char *arg);        /* select next(1) / previous(-1) tag */
 
 /* util.c */
 void *emallocz(unsigned int size);	/* allocates zero-initialized memory, exits on error */
diff -r 17545de77bcb event.c
--- a/event.c	Sun Jul 22 16:45:45 2007 +0200
+++ b/event.c	Sun Jul 22 16:50:54 2007 +0200
@@ -135,6 +135,10 @@ buttonpress(XEvent *e) {
 					else
 						toggleview(buf);
 				}
+                                else if ( ev->button == Button4 )
+                                  selecttag("-1");
+                                else if ( ev->button == Button5 )
+                                  selecttag("1");
 				return;
 			}
 		}
diff -r 17545de77bcb tag.c
--- a/tag.c	Sun Jul 22 16:45:45 2007 +0200
+++ b/tag.c	Sun Jul 22 16:50:54 2007 +0200
@@ -150,3 +150,20 @@ view(const char *arg) {
 		seltag[i] = True;
 	lt->arrange();
 }
+
+void 
+selecttag(const char *arg) {
+  int i;
+  for (i = 0; i < ntags; i++) {
+    if ( seltag[i] ) {
+      seltag[i] = False;
+      i += (arg ? atoi(arg) : 1);
+      if ( i < 0) i = ntags - 1;
+      if ( i >= ntags) i = 0;
+      seltag[i] = True;
+      lt->arrange();
+      return;
+    }
+  }
+}
+