You want a transition that lasts 24 hours?
If you want to change an image once a day, try using the Date class to control when images are displayed... if it is daily then you could use the "day" (number 0 thru 6) to determine which image should be showing. You could check it every minute (or longer) to see if it needs to be changed to the next day. I don't know why you want any transition though... hardly seems worth it since it happens so seldom relative to the overall scheme of playing the file.
It is for a client that runs a specific special for each day of the week. The specials remain constant for each specific day. I want to create a slider or slideshow or a flash that will loop over the seven day period so I am not having to go in and change images every day on the website...Make sense?
You could use the Date class and check the day property of it and have that decide which image you show.
There are a variety of ways to make it work. If you were to just plant the images on frames 1 thru 7 of the timeline (representing Sunday thru Saturday) you could simply use the following on frame 1...
var today:Date = new Date();
gotoAndStop(today.day+1); // day values start at 0
Just so you understand, the file is only running when someone is viewing it on a machine. It is not constantly running such that you catch it where it is at that time. If you expect that it could be displaying constantly, then you would want something in play that is contantly running that code so that it goes to the correct frame when the next day starts.