Sliding menu problem

I’ve been trying to incorporate a sliding menu into my project. I’ve duplicated it a few times and can’t seem to get it to work within my project after 6 hours of trying. seems so simple. - I’ve coded the two buttons at the bottom as b1 and b2 and the contentHold mc has content1 and 2 mc’s
here’s the code.given all mc’s instance names as well. Any other way to do a simple sliding gallery?

var currentPosition:Number = contentHold.content1._x;
var startFlag:Boolean = false;
menuSlide = function (input:MovieClip) {

if (startFlag == false) {

startFlag = true;

var finalDestination:Number = input._x;
var distanceMoved:Number = 0;
var distanceToMove:Number = Math.abs(finalDestination-currentPosition);
var finalSpeed:Number = .3;
var currentSpeed:Number = 0;
var dir:Number = 1;

if (currentPosition<=finalDestination) {

dir = -1;

} else if (currentPosition>finalDestination) {

dir = 1;

}

this.onEnterFrame = function() {

currentSpeed = Math.round((distanceToMove-distanceMoved+1)finalSpeed);
distanceMoved += currentSpeed;
contentHold._x += dir
currentSpeed;
if (Math.abs(distanceMoved-distanceToMove)<=1) {

contentHold._x = maskMovie._x-currentPosition+dir*distanceToMove;
currentPosition = input._x;
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);

};