Quick Job - MICROCHIP PIC Programmer

We need help with a PIC16F88A microcontroller ADC Interrupt project. We can not implement the ADC interrupt rountine right. With ADC the speed of a stepper motor is controlled. At the moment this is done by ADC polling but this is making the motor sto slow and run not smooth. We need to have ADC run as interrupt service (see code) We use the HI-TECH PICC Lite Compiler. We need you to quick implement the ADC interrupt routine so the motor can be controller without problems Thank you. Looking Forward to work with you.