Sliding Menu - Help with adding _y

Hey all. I’m using the sliding menu posted on Kirupa and I’m trying to add a _y position for the buttons to move the “contentHold.” Everything works so far, but when it comes to clicking the buttons sometimes it loads another “content.” What am I doing wrong?

Thanks! Your help is greatly appreciated!!!

http://www.kirupa.com/developer/flash8/slidingMenu.htm

var currentPositionX:Number = contentHold.content1._x;
var currentPositionY:Number = contentHold.content1._y;

var startFlag:Boolean = false;
menuSlide = function (input:MovieClip) {
if (startFlag == false) {

    startFlag = true;
    
    var finalDestinationX:Number = input._x;
    var finalDestinationY:Number = input._y;
    var distanceMovedX:Number = 0;
    var distanceMovedY:Number = 0;
    var distanceToMoveX:Number = Math.abs(finalDestinationX-currentPositionX);
    var distanceToMoveY:Number = Math.abs(finalDestinationY-currentPositionY);
    var finalSpeed:Number = .3;
    var currentSpeedX:Number = 0;
    var currentSpeedY:Number = 0;
    var dir:Number = 1;
    
    if (currentPositionX<=finalDestinationX) {
        dir = -1;
    } else if (currentPositionX>finalDestinationX) {
        dir = 1;
    }
    if (currentPositionY<=finalDestinationY) {
        dir = -1;
    } else if (currentPositionY>finalDestinationY) {
        dir = 1;
    }
    this.onEnterFrame = function() {
        currentSpeedX = Math.round((distanceToMoveX-distanceMovedX+1)*finalSpeed);
        currentSpeedY = Math.round((distanceToMoveY-distanceMovedY+1)*finalSpeed);
        distanceMovedX += currentSpeedX;
        distanceMovedY += currentSpeedY;
        contentHold._x += dir*currentSpeedX;
        contentHold._y += dir*currentSpeedY;
        if (Math.abs(distanceMovedX-distanceToMoveX)<=1) {
            contentHold._x = maskMovie._x-currentPositionX+dir*distanceToMoveX;
            currentPositionX = input._x;
            startFlag = false;
            delete this.onEnterFrame;
        if (Math.abs(distanceMovedY-distanceToMoveY)<=1) {
            contentHold._y = maskMovie._y-currentPositionY+dir*distanceToMoveY;
            currentPositionY = input._y;
            startFlag = false;
            delete this.onEnterFrame;
            }
        };
    }
}

};
b1.onRelease = function() {
menuSlide(contentHold.content1);
};
b2.onRelease = function() {
menuSlide(contentHold.content2);
};
b3.onRelease = function() {
menuSlide(contentHold.content3);
};
b4.onRelease = function() {
menuSlide(contentHold.content4);
};
b5.onRelease = function() {
menuSlide(contentHold.content5);
};