I can't click my buttons

Hi everyone,

I have a problem about my mc. This mc is following mouse; left - right and it has 7 buttons in side. But i can’t click. Why? Function is bellow

mcPortfolioGallery.onRollOver = function() {

this.onMouseMove = function() {
panPortfolio(mcPortfolioGallery,4,1);
};

function panPortfolio(target:MovieClip, speed:Number, dir:Number) {
var mousePercent:Number = _xmouse/Stage.width;
var mSpeed:Number;
if (dir == 1) {
mSpeed = mousePercent;
} else {
mSpeed = 1-mousePercent;
}
target.destX = Math.round(-((target._width-Stage.width)mSpeed));
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));
}
};
}
};