Interactive Image Panning

Hi.
I’ve acted upon your tuturial here and even added the Yscale to make it more fluent, but I lack flexibility in mouse movement.
Here’s the link to what the image is supoosed to move like:
http://bedtimestoryband.com/test/vlab/01/index.html

and mine moves and kinda gets stuck:
http://www.spice-e.net/samples/vlab/vlab.html

This is the code in the flash:
this.onMouseMove = function() {
constrainedMove(bg_mc, 15, 1);
};
function constrainedMove(target:MovieClip, speed:Number, dir:Number) {
var mousePercent:Number = _xmouse/Stage.width;
var mouseYPercent:Number = _ymouse/Stage.height;

var mSpeed:Number;
if (dir == 2) {
mSpeed = 1-mou0.sePercent;
} else {
mSpeed = mousePercent;
}
var mYSpeed:Number;
if (dir == 2) {
mYSpeed = 1-mouseYPercent;
} else {
mYSpeed = mouseYPercent;
}

target.destX = Math.round(-((target._width-Stage.width)*mSpeed));
target.destY = Math.round(-((target._height-Stage.height)*mYSpeed));

target.onEnterFrame = function() {

if (target._x == target.destX) {
delete target.onEnterFrame;
} else if (target._x>target.destX) {
target._x -= Math.ceil((target._x-target.destX)(speed/100));
} else if (target._x<target.destX) {
target._x += Math.ceil((target.destX-target._x)
(speed/100));
}

if (target._y == target.destY) {
delete target.onEnterFrame;
} else if (target._y>target.destY) {
target._y -= Math.ceil((target._y-target.destY)(speed/100));
} else if (target._y<target.destY) {
target._y += Math.ceil((target.destY-target._y)
(speed/100));
}

};
}
Thanks for the help
Galia