Next button for xml mp3 player

programming flash
1

Ok right now I have the mp3 player somewhat working. My next button is giving me issues. To solve the fact of hiting previous when you are at song[0] I have this checkPrev function:


var titles:Array = new Array();
var totalNodes:Number;
trackTitle.autoSize = true;
audioxml.ignoreWhite = true;
audioxml.onLoad = function() {
    totalNodes = this.firstChild.childNodes.length;
    for (i=0; i<totalNodes; i++) {
        songs.push(this.firstChild.childNodes*.attributes.src);
        titles.push(this.firstChild.childNodes*.firstChild.nodeValue);
        }
    startMP3(count);
};

function checkPrev() {
    if (count == 0) {
        prevBtn.gotoAndStop("prevUp");
        prevBtn.enabled = false;
    } else {
        prevBtn.enabled = true;
    }
}

audioxml.load("audiofeed.xml");
var mp3:Sound = new Sound();
function startMP3(songNum:Number):Void {
    checkPrev();
    mp3.loadSound(songs[songNum], true);
    trackTitle.text = titles[count];
    mp3.onSoundComplete = function():Void  {
        count++;
        if (count<totalNodes) {
            startMP3(count);
        } else {
            count = 0;
            startMP3(count);
        }
    }
}

So that code plays and disables the prev button if count == 0. I wanted to do the same for the next button meaning something like this:



// totalNodes is a var i defined above this code: 'totalNodes = this.firstChild.childNodes.length;'
function checkNext() {
    if (count == totalNodes) {
        nextBtn.gotoAndStop("nextUp");
        nextBtn.enabled = false;
    } else {
        nextBtn.enabled = true;
    }
}

So basically if count == the length of the playlist disable the next button. Well it isnt working for some reason. Any ideas?