diff --git a/AutoClicker3000.ino b/AutoClicker3000.ino
index 0a38e01..f80afcb 100644
--- a/AutoClicker3000.ino
+++ b/AutoClicker3000.ino
@@ -46,11 +46,23 @@ char *modeNames[] = {
   "Walk forward    "
 };
 
+extern void clickActivate();
+extern void clickSlower();
+extern void clickFaster();
+extern void walkBackward();
+
+void (*upButtonFuncs[])() = { NULL, NULL };
+void (*downButtonFuncs[])() = { clickActivate, walkBackward };
+void (*leftButtonFuncs[])() = { clickSlower, NULL };
+void (*rightButtonFuncs[])() = { clickFaster, NULL };
+
+
 bool doClicking = false;
 unsigned long lastClickTime = 0;
 int clickColor = 0;
 
 
+
 void setup() {
   Serial.begin(9600);
 
@@ -93,49 +105,32 @@ void loop() {
   debounce(select, buttons & BUTTON_SELECT);
 
   if (buttons) {
-    //    if (buttons & BUTTON_UP) {
-    //      //Keyboard.write('u');
-    //      Serial.println("UP");
-    //      lcdLastSet = millis();
-    //    }
-    //
+    if (triggered(up)) {
+      if (upButtonFuncs[currMode] != NULL) {
+        upButtonFuncs[currMode]();
+      }
+    }
 
     if (triggered(down)) {
-      doClicking = !doClicking;
-      lcd.setCursor(0, 1);
-      if (doClicking) {
-        lcd.print("Start clicking ");
-      } else {
-        lcd.print("Stop clicking  ");
+      if (downButtonFuncs[currMode] != NULL) {
+        downButtonFuncs[currMode]();
       }
-      lcd.setBacklight(WHITE);
-      lcdLastSet = millis();
     }
 
     if (triggered(left)) {
-      lcd.setCursor(0, 1);
-      lcd.print("Slower ");
-      // slow down clicking
-      if (clickDelay < 1000) {
-        clickDelay += delayChange;
+      if (leftButtonFuncs[currMode] != NULL) {
+        leftButtonFuncs[currMode]();
       }
-      lcdLastSet = millis();
     }
 
     if (triggered(right)) {
-      lcd.setCursor(0, 1);
-      lcd.print("Faster ");
-      // speed up clicking
-      if (clickDelay > 50) {
-        clickDelay -= delayChange;
+      if (rightButtonFuncs[currMode] != NULL) {
+        rightButtonFuncs[currMode]();
       }
-      lcdLastSet = millis();
     }
 
     if (triggered(select)) {
-      currMode = (currMode + 1) % MODE_COUNT;
-      lcd.setCursor(0, 0);
-      lcd.print(modeNames[currMode]);
+      changeMode();
     }
   }
 
@@ -162,3 +157,51 @@ void loop() {
     lcdLastSet = 0;
   }
 }
+
+void changeMode() {
+  // TODO cancel current mode before changing (stop clicking)
+  currMode = (currMode + 1) % MODE_COUNT;
+  lcd.setCursor(0, 0);
+  lcd.print(modeNames[currMode]);
+}
+
+// mode functions
+
+void clickActivate() {
+  doClicking = !doClicking;
+  lcd.setCursor(0, 1);
+  if (doClicking) {
+    lcd.print("Start clicking ");
+  } else {
+    lcd.print("Stop clicking  ");
+  }
+  lcd.setBacklight(WHITE);
+  lcdLastSet = millis();
+}
+
+void clickSlower() {
+  if (clickDelay < 1000) {
+    clickDelay += delayChange;
+  }
+
+  lcd.setCursor(0, 1);
+  lcd.print("Slower ");
+  lcdLastSet = millis();
+}
+
+void clickFaster() {
+  // speed up clicking
+  if (clickDelay > 50) {
+    clickDelay -= delayChange;
+  }
+
+  lcd.setCursor(0, 1);
+  lcd.print("Faster ");
+  lcdLastSet = millis();
+}
+
+void walkBackward() {
+  lcd.setCursor(0, 1);
+  lcd.print("Walk backward ");
+  lcdLastSet = millis();
+}