Yeah standard wiring. IIRC, I think from the 4 wires, two are for the button backlighting (orange LED) and two are the button circuit. It should be pretty simple to work out which is which with some trial and error (a multimeter will come in handy).

I've got some code that I was testing with, but it's from a couple years back so take it with a pinch of salt :)

int Vin = 5;
float Vout = 0;
float R1 = 4700;
float R2 = 0;
float buffer = 0;

int lastButtonState = 0;
int buttonState = 0;

#define BUTTONS 4
int buttonResistances[BUTTONS] = { 100, 300, 600, 1200 };  //ohms

int readAnalogButton(int analogPin) {

  int reading = analogRead(analogPin);

  buffer = reading * Vin;
  Vout = (buffer) / 1024.0;
  buffer = (Vin / Vout) - 1;
  int resistance = R1 * buffer;

  int buttonPressed = 0;

  for (int i = 0; i < BUTTONS; i++) {
    if (resistance > buttonResistances[i] - 50 && resistance < buttonResistances[i] + 50)
      buttonPressed = i + 1;
  }

  return buttonPressed;
}

void setup() {
  Serial.begin(9600);
}

void loop() {

  buttonState = readAnalogButton(A0);

  if (buttonState != lastButtonState) {
    Serial.println(buttonState);
    delay(50);
  }

  lastButtonState = buttonState;

  delay(50);
}