Next and previous buttons for slideshow

I am trying to build a type of slideshow but I dont really know how to tell the actionscript that when I click next button it should proform the next image function and same for the previous button…
I have a bit of code like this:(which operates a component I am using)


//the time in miliseconds, which is between images
var slideShowDelay:Number=1500;

//curent position
var curentPosition:Number=0;
//the number of the images, from the xml
var totalImages:Number=0;
var intervalId:Number;
var imagesArray:Array=[]
var isSliding:Boolean=false;
var _xml:XML;
var me=this;

//method used to start the slideshow
function startSlideShow()
{
	isSliding=true;
	showNextImage();
}
//method used to stop the slideshow
function stopSlideShow()
{ 
	clearInterval(intervalId);	
	isSliding=false;
}
//method used to play the next image from the slideshow
function showNextImage()
{
	loadImage(curentPosition+1);
}
//method used to play the previous image from the slideshow
function showPreviousImage()
{
	loadImage(curentPosition-1);
}
/**
	method used to jump to a specified index 
	usage: loadImage(3);
*/
function loadImage(nr:Number)
{
	//cecking if the nr is between 0 and totalImage
	if(nr>totalImages-1)
		nr=0;
	if(nr<0)
		nr=totalImages;
	//set the curent position to the new one
	curentPosition=nr;
	
	//start loading the new image
	me.ldr.contentPath=me.imagesArray[curentPosition];
	//clear the interval used for slideshow
	clearInterval(me.intervalId)

}
//a listener, used to know when the transition has finished
var obj={};
obj.onTransitionEnd=function()
{
	
	if(me.isSliding==true)
		me.intervalId = setInterval(me,"showNextImage", me.slideShowDelay )
	
}
ldr.addEventListener("onTransitionEnd", obj)

//loading the xml file.
_xml=new XML();
_xml.load("test.xml")
_xml.ignoreWhite=true
_xml.onLoad=function(succes)
{
	if(succes)
	{
		//parsing the xml, and push the images path to imagesArray
		for(var aNode=this.firstChild.firstChild;aNode!=null; aNode=aNode.nextSibling)
		{
			me.imagesArray.push(aNode.attributes.path);
		}
		me.totalImages=this.firstChild.childNodes.length;
		//start the slideshow
		me.startSlideShow();
	}
}



I figure it is in this part that I need to make some changes. But what I am stuck with is if I give my buttons instance names like nxt_btn and prv_btn how do I get them interacting with these functions?


//method used to play the next image from the slideshow
function showNextImage()
{
	loadImage(curentPosition+1);
}
//method used to play the previous image from the slideshow
function showPreviousImage()
{
	loadImage(curentPosition-1);
}

Sorry if that is unclear but I dont really understand lol.