Well, the idea was sent to me by Zach Desm, who wanted me to create an indicator based on Connie Brown's work. I created and then sent him it, and now he is selling an indicator that looks exactly like this...
More fool me. I wouldn't be using this indicator anyway - having gone to the source myself, I can see that Zach has misunderstood the original text.
You can get a newer and more updated RSI in my scripts - please use this, for free.