Небольшая ошибка в коде

var onionLength = 25;
var maxSize = 150;
var obj:Object = new Object();
Mouse.addListener(obj);
obj.onMouseMove = function() {
lastMouse = getTimer();
};
for (var i = 0; i < onionLength; i++) {
this.attachMovie("onion", "onion" + i, i, {
_xscale:maxSize / onionLength * i + 100,
_yscale:maxSize / onionLength * i + 100,
_alpha:100 − 100 / onionLength * i
});
}
onion0._visible = false;
function setOnion(o:MovieClip):Void {
onion0._x = _xmouse;
onion0._y = _ymouse;
for (var i = 1; i < onionLength; i++) {
o["onion" + i]._x += (o["onion" + (i − 1)]._x − o["onion" + i]._x) / 2;
o["onion" + i]._y += (o["onion" + (i − 1)]._y − o["onion" + i]._y) / 2;
o["onion" + i]._rotation = Math.atan2((o["onion" + i]._y − _ymouse), (o["onion" + i]._x − _xmouse)) * 180 / Math.PI;
}
}
function onionDist():Number {
return Math.sqrt(Math.pow(this["onion" + (onionLength − 1)]._x − onion0._x, 2) + Math.pow(this["onion" + (onionLength − 1)]._y − onion0._y, 2));
}
function checkUserMouse(o:MovieClip, delay:Number):Void {
if (getTimer() − lastMouse > Math.pow(onionDist(), delay)) {
for (var i = 1; i < onionLength; i++) {
o["onion" + i]._visible = false;
}
}
else {
for (var i = 1; i < onionLength; i++) {
o["onion" + i]._visible = true;
}
}
}
setInterval(setOnion, 50, this);
setInterval(checkUserMouse, 50, this, 2);