Detecting RSI crossing 70 and 30

["Joel Reymont" <joelr@xxxxxxxx>]

Folks,

What's the best way to detect when RSI crosses 
the 70 and 30 values on the way up or down?

For example, I was trying to use 
RSI(Ref(C, -1),5) < 30 AND RSI(C, 5) > 30
to detect the RSI moving up through 30 
but it doesn't seem to be working.

    Thanks, Joel