tell application "iCal"
	activate
	try
		set sourceCal to first calendar whose title is "Anniversaires"
	on error
		return
	end try
	set myNumber to text returned of (display dialog "Combien de jours en avance, la premiere alarme ?" default answer "0")
	try
		myNumber as integer
	end try
	set mySecondNumber to text returned of (display dialog "Combien de jours en avance, la deuxieme alarme ?" default answer "0")
	try
		mySecondNumber as integer
	end try
	repeat with myEvent in (get events of sourceCal)
		delete every display alarm of myEvent
		make new display alarm at beginning of myEvent with properties {trigger interval:-((myNumber * days) / (1 * minutes))}
		make new display alarm at beginning of myEvent with properties {trigger interval:-((mySecondNumber * days) / (1 * minutes))}
	end repeat
end tell