In outlook there is a calender which you can setup for reminders.. for weekly daily or just one time.

What i'm looking for is a daily reminder that comes up at 3-4 different times a day. Either popup window or splash div box w/ disable background.

I have a base line idea like not sure if this is right now not:
get current time subtract from the reminder time to setup a timeout to popup window or function.

Anyone can help me with this or point me to the right direction..