Code simple alerts for MT4 Indicator - Metatrader

I have attached a metatrader indicator to this project. I need popup and sound alert and email alert after the slope passes +0.25 going up and again when it pass -0.25 going down. I would like to have the option to change the alert level; for instance if I wanted alerts at the +0.50 and -0.50 levels. The alerts should happen only once when the slope passes that level; do not alert for every candle passed the level. The email and popup alerts should tell which pair has the alert and at what time (ex. EURUSD 5:30pm Slope greater than 0.25)