Need some help on some code

programming flash
1

Alright, we have a symbol, called ‘auto’
here’s his code:

onClipEvent (load) {
    xto = _x+1;
    yto = _y+1;
    dir = 1;
    dirto = 0;
    rotspeed = 30;
    speed = 20;
    //dis = Math.sqrt(((xto-_x)*(xto-_x))+((yto-_y)*(yto-_y)));
    dirdif = 0;
}
onClipEvent (mouseDown) {
    xto = _root._xmouse;
    yto = _root._ymouse;
}
onClipEvent (enterFrame) {
    dis = Math.sqrt(((xto-_x)*(xto-_x))+((yto-_y)*(yto-_y)));
    if (dis>10) {
        dirto = Math.atan2(yto-_y, xto-_x)/(Math.PI/180);
        dirdif = dirto-dir;
        dirdif = dirdif-360*Math.round(dirdif/360);
        dir += Math.max(-1*rotspeed,Math.min(rotspeed,dirdif));
        _rotation = dir;
        _x += Math.cos(dir*Math.PI/180)*speed;
        _y += Math.sin(dir*Math.PI/180)*speed;
    }
}

well, this is working all fine.
The object turns and goes to where we click.

What we want now is that, when object ‘rots’ is in his way he will choose the shortest way around it.

Can anyone help me on this?

thanks in advance