Adding an auto play button to my flash movie

images_xml = new XML();
images_xml.onLoad = startImageViewer;
images_xml.load("xml/images.xml");
images_xml.ignoreWhite = true;

function startImageViewer(success) {
    if (success == true) {
        rootNode = images_xml.firstChild;
        totalImages = rootNode.childNodes.length;
        firstImageNode = rootNode.firstChild;
        currentImageNode = firstImageNode;
        currentIndex = 1;
        updateImage(firstImageNode);
    }
}

function updateImage(newImageNode) {
    
    imagePath = newImageNode.attributes.jpegURL;
    imageText = newImageNode.firstChild.nodeValue;
    targetClip.loadMovie(imagePath);
    
}
 
next_btn.onRelease = function() {
    nextImageNode = currentImageNode.nextSibling;
    if (nextImageNode == null) {
        break;
    } else {
        currentIndex++;
        updateImage(nextImageNode);
        currentImageNode = nextImageNode;
    }
};

back_btn.onRelease = function() {
    previousImageNode = currentImageNode.previousSibling;
    if (previousImageNode == null) {
        break;
    } else {
        currentIndex--;
        currentImageNode = previousImageNode;
        updateImage(previousImageNode);
    }
};