how do i call a void function() and why does it not compile?!

trying to write a function to output a servo pulse (1.5ms high, 22 ms low) but i do not under stand functions.

into QBASIC i would type CALL xxx
or in ASM i would type RCALL xxx

how do i do this in the arduino?

code will not compile.

Code:

void setup() {
// put your setup code here, to run once:
int a = 0;
int b = 0;

int axisX = 6;
int axisY = 7;
int axisZ = 8;
int axisA = 9;

int joystickX = 0;
int joystickZ = 0;
int triggers = 0;
int joystickT = 0;

pinMode(axisX, OUTPUT);
pinMode(axisY, OUTPUT);
pinMode(axisZ, OUTPUT);
pinMode(axisA, OUTPUT);
pinMode(joystickX, INPUT);
pinMode(joystickZ, INPUT);
pinMode(triggers, INPUT);
pinMode(joystickT, INPUT);
}

void loop() {
// put your main code here, to run repeatedly:

int a = 1500;

servoX (int a, int axisX);

}

void servoX(int a, int axisX) {

digitalWrite(axisX, HIGH); //begin position pulse
delayMicroseconds(a);
digitalWrite(axisX, LOW); //end position pulse
delay(22); //servo dead time, 22 ms
}

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