Retracement indicator

I am looking for an indicator which sends an alert (soundwawe, pop up window and target on the chart) in such conditions:

The price retraces below (or over) two emas, 10 and 20 for example.
When the price is going back over (or below) those two emas I would like to receive this signal ( once and once only,if possible ).

Do you know where I can find such an indicator? Or could someone programm it?
Thank you on advance for your help.

By definition, the price has to hit the first EMA before it hits the second one in a retracement. Therefore you only need to have an indicator that signals for a single EMA - the second one.

When the price moves strongly in either direction, the two EMAs are going to separate signifigantly with the longer EMA always lagging the shorter one. When the price retraces it will hit the shorter EMA and may continue until it also hits the longer one. It can't hit the longer one first.

I wrote an indicator called RTSignal.mq4 and I think it will do what you want. I haven't used it myself so I don't know what bugs exist, but there hasn't been any negative feedback so I am confidant it works OK. You will find the code and the explanation in Post 4 of the link.

If you find a problem, I will fix. If you want an enhancement other than a second EMA, I will consider.

http://www.forexfactory.com/showthread.php?t=200649