Want to generate PWM of 30 hz and 60 hz on single pin of the arduino board

Projects Programming
1

First of all thanks for reading this.

I m able to change the frequency of the pwm signals generated by the servo.write()function by changing the code in the servo library .So i can get the PWM of desired frequency.

code from servo.h where i have made changes to get pwm of the desired frequency:
from
#define MIN_PULSE_WIDTH 544 // the shortest pulse sent to a servo
#define MAX_PULSE_WIDTH 2400 // the longest pulse sent to a servo
#define DEFAULT_PULSE_WIDTH 1500 // default pulse width when servo is attached
#define REFRESH_INTERVAL 20000 // minumim time to refresh servos in microseconds

to
#define MIN_PULSE_WIDTH 544 // the shortest pulse sent to a servo
#define MAX_PULSE_WIDTH 2400 // the longest pulse sent to a servo
#define DEFAULT_PULSE_WIDTH 1500 // default pulse width when servo is attached
#define REFRESH_INTERVAL 33333 // minumim time to refresh servos in microseconds

After changing the above code i m able to get PWM of frequency 30hz(and period of (1/30)sec=33333 usec)

Now my problem is that i want to generate PWM of both 30HZ and 60 HZ on the same pin of the arduino alternately...please help me in this regard

The programme to generate PWM i used is ;

#include <Servo.h>
Servo servo00;
int pwm1 = 10;
void setup()
{
pinMode(pwm1, OUTPUT); //10 pin as OUTput pwm1
servo00.attach(10); //10 pin is attached as output for motor1
}

void loop()
{
servo00.write(180);
delay(3000);
}