need help with programming a moving average

plz if someone can help

1. i need a custom moving average programmed for mt4 based on the following formula:

(sma5high + sma5low + sma21high + sma21low) / 8

2. i would also need the instructions re: how to attach it to my charts from 5m to daily

i am kind of new and would really appreciate the help

thx and best of all,

eula44