diff -r 19d11014bc63 config.def.h
--- a/config.def.h	Mon Nov 05 04:02:20 2012 +0100
+++ b/config.def.h	Tue Nov 06 19:37:50 2012 +0100
@@ -86,6 +86,10 @@
 	{ XK_F12,       XK_NO_MOD, "\033[24~" },
 };
 
+/* Mouse scrollwheel functions */
+static char button4[] = "\031";
+static char button5[] = "\005";
+
 /* Internal shortcuts. */
 #define MODKEY Mod1Mask
 
diff -r 19d11014bc63 st.c
--- a/st.c	Mon Nov 05 04:02:20 2012 +0100
+++ b/st.c	Tue Nov 06 19:37:50 2012 +0100
@@ -673,6 +673,10 @@
 		sel.mode = 1;
 		sel.ex = sel.bx = x2col(e->xbutton.x);
 		sel.ey = sel.by = y2row(e->xbutton.y);
+	} else if(e->xbutton.button == Button4) {
+		ttywrite(button4, strlen(button4));
+	} else if(e->xbutton.button == Button5) {
+		ttywrite(button5, strlen(button5));
 	}
 }