Help with Stepper Motor!

Hello,
I just got my arduino yesterday!! I also got a motor shield and a cuple steppers from a surplus store. One of the motors I got up and running with a very simple program. I want to write a more advanced one using the stepper library. My only problem is that the stepper im using needs two coils on at all times but the stepper library seems to only run one coil at a time. can anyone help?? :-/

heres the code im running now:

int motorPin1 = 13;
int motorPin2 = 10;
int motorPin3 = 12;
int motorPin4 = 9;
int delayTime = 5;

void setup() {
pinMode(motorPin1, OUTPUT);
pinMode(motorPin2, OUTPUT);
pinMode(motorPin3, OUTPUT);
pinMode(motorPin4, OUTPUT);
}

void loop() {
digitalWrite(motorPin1, HIGH);
digitalWrite(motorPin2, HIGH);
digitalWrite(motorPin3, LOW);
digitalWrite(motorPin4, LOW);
delay(delayTime);
digitalWrite(motorPin1, LOW);
digitalWrite(motorPin2, HIGH);
digitalWrite(motorPin3, HIGH);
digitalWrite(motorPin4, LOW);
delay(delayTime);
digitalWrite(motorPin1, LOW);
digitalWrite(motorPin2, LOW);
digitalWrite(motorPin3, HIGH);
digitalWrite(motorPin4, HIGH);
delay(delayTime);
digitalWrite(motorPin1, HIGH);
digitalWrite(motorPin2, LOW);
digitalWrite(motorPin3, LOW);
digitalWrite(motorPin4, HIGH);
delay(delayTime);
}