ActionScript 3.0 :: Transition Manager And Background Images For Website

I am trying to do the background images for a website, but I want them transitioning. So what I done is import each image onto its own layer (four images in total), and I turned them all into a movieclip. I am then trying to add some code to make them transition between each other. I am attempting something like

var myTM:TransitionManager = new TransitionManager(my_mc);
var myTM1:TransitionManager = new TransitionManager(my_mc1);
var myTM2:TransitionManager = new TransitionManager(my_mc1);
myTM.startTransition({type:Fly, direction:Transition.IN, duration: 3, easing:Back.easeOut}) myTM.addEventListener("allTransitionsInDone", doneTrans);
function doneTrans(e:Event):void{
[Code] .....

Is there a more logical way to do this? Each image is a movie clip and I basically want them like a background slideshow?