Double MA crossing

Hi.

I would like to have a script that generates notifications on selected timeframes under the following conditions:

LONG

1) period 1, period 2: price > exponential moving average 12 period AND price > exponential moving average 100 period AND EMA 12 > EMA 100

2) period 3: price closes < EMA 12 AND >EMA 100

3) period 4: price closes > EMA 12 AND > EMA 100

Signal is given after period 4 is completed.

SHORT signals:

reverse all rules.

Regards

Gerhard