Image slideshow with navigation

Content
1

Hi All,
I am a little new to flash and would like some help. I want to create an image slide show which reads images from an XML file. i also want there to be previous and next navigation buttons. i got the slideshow working great but cant seem to get the buttons to work. help, anyone??
thanks alot!
this is the action script i am using:

import mx.transitions.Tween;
import mx.transitions.easing.*;

var myShowXML = new XML();
myShowXML.ignoreWhite = true;
myShowXML.load(“slideshow.xml”);

myShowXML.onLoad = function() {
_root.myWidth = myShowXML.firstChild.attributes.width;
_root.myHeight = myShowXML.firstChild.attributes.height;
_root.mySpeed = myShowXML.firstChild.attributes.speed;

_root.myImages = myShowXML.firstChild.childNodes;
_root.myImagesNo = myImages.length;

createContainer();
callImages();

};

function createContainer() {
_root.createEmptyMovieClip(“myContainer_mc”,1);

myContainer_mc.lineStyle(0);
myContainer_mc.lineTo(_root.myWidth,0);
myContainer_mc.lineTo(_root.myWidth,_root.myHeight);
myContainer_mc.lineTo(0,_root.myHeight);
myContainer_mc.lineTo(0,0);

myContainer_mc._x = (Stage.width-myContainer_mc._width)/2;
myContainer_mc._y = (Stage.height-myContainer_mc._height)/2;

}

function callImages() {

_root.myMCL = new MovieClipLoader();
_root.myPreloader = new Object();
_root.myMCL.addListener(_root.myPreloader);

_root.myClips_array = [];

_root.myPreloader.onLoadStart = function(target) {

	_root.createTextField("myText_txt",_root.getNextHighestDepth(),0,0,100,20);
	_root.myText_txt._x = (Stage.width-_root.myText_txt._width)/2;
	_root.myText_txt._y = (Stage.height-_root.myText_txt._height)/2;
	_root.myText_txt.autoSize = "center";

	_root.myText_txt.text = "test";

};

_root.myPreloader.onLoadProgress = function(target) {

	_root.myText_txt.text = "Loading.. "+_root.myClips_array.length+"/"+_root.myImagesNo+" Completed";

};


_root.myPreloader.onLoadComplete = function(target) {

	_root.myClips_array.push(target);
	target._alpha = 0;

	if (_root.myClips_array.length == _root.myImagesNo) {

		_root.myText_txt._y = myContainer_mc._y + myContainer_mc._height;
		_root.target_mc = -1;
		moveSlide();
		myShowInt = setInterval(moveSlide, (_root.mySpeed*1000)+1000);


	}

};

for (i=0; i<_root.myImagesNo; i++) {

	temp_url = _root.myImages[i].attributes.url;
	temp_mc = myContainer_mc.createEmptyMovieClip(i, myContainer_mc.getNextHighestDepth());

	_root.myMCL.loadClip(temp_url,temp_mc);
}

}

function moveSlide() {

current_mc = _root.myClips_array[_root.target_mc];
new Tween(current_mc, "_alpha", Strong.easeOut, 100, 0, 1, true);

_root.target_mc++;

if (_root.target_mc>=_root.myImagesNo) {
	_root.target_mc = 0;
}

//_root.myText_txt.text = _root.myImages[target_mc].attributes.title;
next_mc = _root.myClips_array[_root.target_mc];
new Tween(next_mc, "_alpha", Strong.easeOut, 0, 100, 1, true);

}

btnNext.onRelease = function() {
callImages();
};