Flash Slideshow Help

I am trying to create a slideshow from a premade gallery script I found once. The reason for using it was its ease of use. However I have encountered some issues that I really want this slideshow to have.

  1. Automatic Change to the next image with a Pause Button.
  2. Also I want to understand how the desc_text instance reads the <Caption> tags in the XML. I intend to have a Heading Option as well, but I can’t seem to find a logical answer to do it.
function loadXML(loaded) {
	if (loaded) {
		xmlNode = this.firstChild;
		image = [];
		description = [];
		total = xmlNode.childNodes.length;
		for (i=0; i<total; i++) {
			image[i] = xmlNode.childNodes[i].childNodes[0].firstChild.nodeValue;
			description[i] = xmlNode.childNodes[i].childNodes[1].firstChild.nodeValue;
		}
		firstImage();
	} else {
		content = "file not loaded!";
	}
}
xmlData = new XML();
xmlData.ignoreWhite = true;
xmlData.onLoad = loadXML;
xmlData.load("xmldata/advertisements.xml");
/////////////////////////////////////
listen = new Object();
listen.onKeyDown = function() {
	if (Key.getCode() == Key.LEFT) {
		prevImage();
	} else if (Key.getCode() == Key.RIGHT) {
		nextImage();
	}
};
Key.addListener(listen);
previous_btn.onRelease = function() {
	prevImage();
};
next_btn.onRelease = function() {
	nextImage();
};
/////////////////////////////////////
p = 0;
this.onEnterFrame = function() {
	filesize = picture.getBytesTotal();
	picture.forceSmoothing = true;
	loaded = picture.getBytesLoaded();
	preloader._visible = true;
	if (loaded != filesize) {
		preloader.preload_bar._xscale = 100*loaded/filesize;
	} else {
		preloader._visible = false;
		if (picture._alpha<100) {
			picture._alpha += 10;
		}
	}
};
function nextImage() {
	if (p<(total-1)) {
		p++;
		if (loaded == filesize) {
			picture._alpha = 0;
			picture.loadMovie(image[p], 1);
			desc_txt.text = description[p];
			picture_num();
		}
	}
}
function prevImage() {
	if (p>0) {
		p--;
		picture._alpha = 0;
		picture.loadMovie(image[p],1);
		desc_txt.text = description[p];
		picture_num();
	}
}
function firstImage() {
	if (loaded == filesize) {
		picture._alpha = 0;
		picture.loadMovie(image[0], 1);
		desc_txt.text = description[0];
		picture_num();
	}
}
function picture_num() {
	current_pos = p+1;
	pos_txt.text = current_pos+" / "+total;
}