Formula help

["Nick Channon" <nick.channon@xxxxxxxxxxxxx>]

I wonder if anybody can give me a clue as to how to 
achieve the following:
 
I have plotted a 200-day exponential moving 
average, and also:
* above it, the same MA but with a vertical shift 
of 0.1%
* below it, the same MA but with a vertical shift 
of 0.1%
 
This obviously creates 3 parallel 
bands.
 
I want to set up an alert that fires when the price 
touches or drops below the top band, and another that fires when the price 
touches or rises above the bottom band.
 
All suggestions welcome.
 
Many thanks,
Nick