XML and Image Gallery

Hi all
I want to create an image gallery like the nvidia site : http://www.nvidia.com/page/home.html
If you see the flash intro, you can see that 4 images with description will load and loop continually.
I have created the xml part in flash, but the problem is :

  1. how can i make pause between images that are showing ?
  2. how can i make it looping ?

i am images from a directory with xml.

function loadXML(loaded) {
    if (loaded) {
        xmlNode = this.firstChild;
        images = [];
        titles = [];
        total = xmlNode.childNodes.length;
        for (i=0; i<total; i++) {
            _root.images = xmlNode.childNodes*.childNodes[0].firstChild;
            _root.desc = xmlNode.childNodes*.childNodes[1].firstChild;
            _root.textHolder.textHolder.text = _root.desc;
            loadMovie(images, imageHolder);

    } else {
        trace("file not loaded!");
xmlData = new XML();
xmlData.ignoreWhite = true;
xmlData.onLoad = loadXML;

please help me…