Timer Interrupt: arduino

Timer Interrupt: arduino

I'm stuck in this. I'm writing arduino program that should simply sample
both FSR and EMG A\D outputs with a sampling rate of 100 Hz (using timer
interrupts to do this rather than a "delay" loop).
This is how the output should look like.
Counter, FSR, EMG, 0 , val_x, val_y, 1, val_x1, val_y1, 2, val_x2, val_y3,
n-1, val_xn-1, val_yn-1,
But I'm finding it extremely difficult. I'll be glad if someone can be of
help.