we are trying to program a servo on one of the joy stick buttons. we got the servo to work without the joy stick but adding the joy stick we get a servo out of range error

here is the code, any help would be great, thanks

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#pragma config(Hubs, S1, HTMotor, none, none, none)
#pragma config(Sensor, S1, , sensorI2CMuxController)
#pragma config(Motor, mtr_S1_C1_1, motorD, tmotorNormal, openLoop, reversed)
#pragma config(Motor, mtr_S1_C1_2, motorE, tmotorNormal, openLoop)
#pragma config(Servo, srvo_S2_C1_1, ramp, tServoStandard)
#pragma config(Servo, srvo_S2_C1_2, servo2, tServoNone)
#pragma config(Servo, srvo_S2_C1_3, servo3, tServoNone)
#pragma config(Servo, srvo_S2_C1_4, servo4, tServoNone)
#pragma config(Servo, srvo_S2_C1_5, servo5, tServoNone)
#pragma config(Servo, srvo_S2_C1_6, servo6, tServoNone)
//*!!Code automatically generated by 'ROBOTC' configuration wizard !!*//

#include "JoystickDriver.c"

const int RAMP_DOWN=255;
const int RAMP_UP = 128;
//TJoystick joystick;

task main()
{
//int i;
//servo(ramp)=160;
while (true)
{
getJoystickSettings(joystick);
motor[motorD] = -joystick.joy1_y2;
motor[motorE] = -joystick.joy1_y1;

if(joy1Btn(4))
{
servoTarget(ramp)=RAMP_DOWN;
}
else if(joy1Btn(2))
{
servoTarget(ramp)= RAMP_UP;
}
/*for (i = 0; i <= 256; i += 16)
{
servo[ramp] = i;
wait1Msec(50);
}
*/
}
}

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First of all, you can use the [code] and [/code] tags to display fixed-width, indented text.

Anyway, the problem is this: you can only send a servo a number between 0 and 255. The analog sticks on the Logitech controllers return values from -128 to 127. So, you have to set the servo's position to the joystick value + 128.