Actionscript movement after a time delay?

I am using some action script to move a group of images around the stage “onrelease” of a button, which all works really well, the code is attached to a movieclip and goes something like this:

onClipEvent (load) {
_x = 0;
_y = 0;
div = 5;
}
onClipEvent (enterFrame) {
_x += (endX-_x)/div;
_y += (endY-_y)/div;

_root.home.onRelease = function() {
endX = 0;
endY = 0;
};
_root.works.onRelease = function() {
endX = -250;
endY = 0;
Bla bla

Anyone know how i can achieve this movement without a button action ie: after mc loads it will move the movieclip every 5 seconds or so untill unload the movie

New to actionscript, so is there an easy way? Iam using MX

Many thanks
Ant