Sliding images

Question

I have a header for a website that has three buttons on the left and when you click on each one it leads to another image that slides in from the right. I am trying to change some of the code in this because it is from someone that does not currently work here anymore and I am not by any means a flash person. I can do simple things so hopefully I will comprehend any answers I get.
Here is what I want this header to do... Right now the only way it changes images is if you click on one of the buttons on the left, I want it to be able to also rotate automatically through them also. Say rotate to the next image every 10 seconds or so. I am pasting the code below  and any help I can get on this would be greatly appreciated.
Thanks
Here is the code from the action layer....
var currentPosition:Number = contentHold.content1._x;
var startFlag:Boolean = false;
menuSlide = function (input:MovieClip) {
            if (startFlag == false) {
                        startFlag = true;
                        var finalDestination:Number = input._x;
                        var distanceMoved:Number = 0;
                        var distanceToMove:Number = Math.abs(finalDestination-currentPosition);
                        var finalSpeed:Number = .3;
                        var currentSpeed:Number = 0;
                        var dir:Number = 1;
                        if (currentPosition<=finalDestination) {
                                    dir = -1;
                        } else if (currentPosition>finalDestination) {
                                    dir = 1;
                        this.onEnterFrame = function() {
                                    currentSpeed = Math.round((distanceToMove-distanceMoved+1)*finalSpeed);
                                    distanceMoved += currentSpeed;
                                    contentHold._x += dir*currentSpeed;
                                    if (Math.abs(distanceMoved-distanceToMove)<=1) {
                                                contentHold._x = maskMovie._x-currentPosition+dir*distanceToMove;
                                                currentPosition = input._x;
                                                startFlag = false;
                                                delete this.onEnterFrame;
b1.onRelease = function() {
            menuSlide(contentHold.content1);
b2.onRelease = function() {
            menuSlide(contentHold.content2);
b3.onRelease = function() {
            menuSlide(contentHold.content3);

Answer 1

you can use:
var menuSlideI:Number;
var currentContent:Number = 1;
var contentTotal:Number = 3;  // update this if you add more slides/buttons
var currentPosition:Number = contentHold.content1._x;
var startFlag:Boolean = false;
menuSlide = function (input:MovieClip) {
            if (startFlag == false) {
                         clearInterval(menuSlideI);
                        currentContent=input._name.split("content")[1];
                        startFlag = true;
                        var finalDestination:Number = input._x;
                        var distanceMoved:Number = 0;
                        var distanceToMove:Number = Math.abs(finalDestination-currentPosition);
                        var finalSpeed:Number = .3;
                        var currentSpeed:Number = 0;
                        var dir:Number = 1;
                        if (currentPosition<=finalDestination) {
                                    dir = -1;
                        } else if (currentPosition>finalDestination) {
                                    dir = 1;
                        this.onEnterFrame = function() {
                                    currentSpeed = Math.round((distanceToMove-distanceMoved+1)*finalSpeed);
                                    distanceMoved += currentSpeed;
                                    contentHold._x += dir*currentSpeed;
                                    if (Math.abs(distanceMoved-distanceToMove)<=1) {
                                                contentHold._x = maskMovie._x-currentPosition+dir*distanceToMove;
                                                currentPosition = input._x;
                                                startFlag = false;
                                                delete this.onEnterFrame;
b1.onRelease = function() {
            menuSlide(contentHold.content1);
b2.onRelease = function() {
            menuSlide(contentHold.content2);
b3.onRelease = function() {
            menuSlide(contentHold.content3);
clearInterval(menuSlideI);
menuSlideInterval=setInterval(menuSlide,10000,contentHold["content"+(1+currentContent%cont entTotal) ]);