Action script in a photo slide show using XML

[Czechfish]

How do I change my script to automatically play, rather than clicking through individual slides?

What is the action script to skip to a specific slide in the show via a button? (Right now I have a next an previous buttons.)

Here is my script:

slides_xml = new XML();
slides_xml.onLoad = startSlideShow;
slides_xml.load("conferencephotos.xml");
slides_xml.ignoreWhite = true;
 
function startSlideShow(success) {
    if (success == true) {
            rootNode = slides_xml.firstChild;
            totalSlides = rootNode.childNodes.length;
            firstSlideNode = rootNode.firstChild;
            currentSlideNode = firstSlideNode;
            currentIndex = 1;
            updateSlide(firstSlideNode);
 
    }
}
 
function updateSlide(newSlideNode) {
    imagePath = newSlideNode.attributes.jpegURL;
    slideText = newSlideNode.firstChild.nodeValue;
    loadMovie(imagePath, targetClip);
}
 
next_btn.onRelease = function() {
    nextSlideNode = currentSlideNode.nextSibling;
    if (nextSlideNode == null) {
        break;
    } else {
        currentIndex++;
        updateSlide(nextSlideNode);
        currentSlideNode = nextSlideNode;
    }
};
 
back_btn.onRelease = function() {
    previousSlideNode = currentSlideNode.previousSibling;
    if (previousSlideNode == null) {
        break;
    } else {
        currentIndex--;
        currentSlideNode = previousSlideNode;
        updateSlide(previousSlideNode);
    }
};