360 rotation offset

programming flash
1

I have a little 360 view rotation thing i made, and now im modifying it to only show part of that view (180), the images i have for this are only 180. I have made a little greyed out spot on the compass and made it stop the arrow from going to that point, but now i need to offset the image that scrolls to be from north to south, but it’s currently scrolling east to west.

Really hard to explain, heres a demo:

http://www.joshuajonah.com/compass.swf

heres the source:

http://www.joshuajonah.com/compass.fla

Heres a little snippet of the code sections:

on the image in the back

  onClipEvent (load)
{
_global.degrees = (this._width-1360)/180

}
on(press){
    startDrag(this, false)
}
on(release){
    this.stopDrag()
}
 
 onClipEvent (enterFrame)
{
    _y = 0
}

on the maintimeline:


stop()
face.onPress = function(){
face.onEnterFrame = function(){
mouse_x = mouseTarget._x;
mouse_y = mouseTarget._y;
xDistance = mouseTarget._x - face._x;
yDistance = mouseTarget._y - face._y;
if (Number(xDistance)<0) {
    normalise = -1 * xDistance;
} else {
    normalise = xDistance;
}
if (Number(yDistance)<0) {
    normalise = Number(normalise)+Number((-1 * yDistance));
} else {
    normalise = Number(normalise)+Number(yDistance);
}
if ((Number(xDistance)>=0) and (Number(yDistance)>=0)) {
    _global.direction = 90*(yDistance/normalise);
} else if ((Number(xDistance)<=0) and (Number(yDistance)>=0)) {
    _global.direction = Number(-1*90*(xDistance/normalise))+90;
} else if ((Number(xDistance)<=0) and (Number(yDistance)<=0)) {
    _global.direction = Number(-1*90*(yDistance/normalise))+180;
} else {
    _global.direction = Number(90*(xDistance/normalise))+270;
}
needle._rotation = _global.direction;
image._x = -_global.direction*_global.degrees
      }
}
face.onMouseUp = function(){
    killdrag()
}
startmoving()
onEnterFrame = function(){
    if (needle._rotation<-90){
        needle._rotation = -90
    }else  if (needle._rotation>90){
        needle._rotation = 90
    }else{
    needle._rotation = -image._x/_global.degrees
}
}

function killdrag(){
    delete face.onEnterFrame
}

Any ideas? my brain hurts… thanx for giving it a go for me