Please help with setting an Alert for this indicator

i have a indicator call"double-cci",now i want set alert for this indicator.if the cci21 up cross 100,i can hear the alert sound for buying,and when the cci21 down cross -100, i can hear the alert sound for selling ,anybody can help me ,thanks a lot!!
here's the indicator!!

Terrel,
I love the look of your indicator. Could you explain more how you use it.