Adding Buttons for each picture in SlideShow

programming flash
1

I have this SlideShow-Script from somewhere here.
I would like to add buttons for each picture, I mean btn1 for loading picture1, btn2 for picture2 and so on.
I tried in different ways, the most logical to me seemed to be:

btn1.onRelease = function() {
 preloadPic(1)
 this.desc_txt.text = description[p];
 picture_num();
};

but nothing works.

Thats the SlideShowScript:

function loadXML(loaded) {
 if (loaded) {
  xmlNode = this.firstChild;
  image = [];
  description = [];
  total = xmlNode.childNodes.length;
  for (i=0; i<total; i++) {
   image* = xmlNode.childNodes*.childNodes[0].firstChild.nodeValue;
   description* = xmlNode.childNodes*.childNodes[1].firstChild.nodeValue;
  }
  id = setInterval(preloadPic, 100);
 } else {
  content = "file not loaded!";
 }
}
xmlData = new XML();
xmlData.ignoreWhite = true;
xmlData.onLoad = loadXML;
xmlData.load("images1.xml");
var p = 0;
var current;
var k = 0;
 // height and width of the square box holding the images
var imgBoxWidth  = 600;
var imgBoxHeight = 600;
function preloadPic() {
 clearInterval(id);
 
 var con = picture.duplicateMovieClip("con"+k, 9984+k);
 
 con.loadMovie(image[p]);
 
 preloader._visible = 1;
 preloader.swapDepths(con.getDepth()+3);
 con._alpha = 0;
 var temp = _root.createEmptyMovieClip("temp"+k, 99+k);
 k++;
 temp.onEnterFrame = function() {
  var total = con.getBytesTotal();
  var loaded = con.getBytesLoaded();
  percent = Math.round(loaded/total*100);
  preloader.preload_bar._xscale = percent;
  if (con._width) {
   con._x += (imgBoxWidth - con._width) / 2   
   con._y += (imgBoxHeight - con._height) / 2
   preloader._visible = 0;
   con.onEnterFrame = fadeIn;
   delete this.onEnterFrame;
  }
 };
}
MovieClip.prototype.fadeIn = function() {
 if (this._alpha<100) {
  current._alpha -= 10;
  this._alpha += 10;
 } else {
  current._visible = 0;
  current = this;
  delete this.onEnterFrame;
 }
};
function nextImage() {
 p<total-1 ? (p++, preloadPic()) : null;
 this.desc_txt.text = description[p];
 picture_num();
}
function prevImage() {
 p>0 ? (p--, preloadPic()) : null;
 this.desc_txt.text = description[p];
 picture_num();
}
function picture_num() {
 current_pos = p+1;
 this.pos_txt.text = current_pos+" / "+total;
}
previous_btn.onRelease = function() {
 prevImage();
};
next_btn.onRelease = function() {
 nextImage();
};

So how should I formulate the onRelease function?
Thanks for helping!