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private function getListenerIndex(func:Function):Number
{
var num:Number = -1;
for(var i:int = 0; i < mouseWheelListeners.length; i++)
{
if(func == mouseWheelListeners[i])
{
num = i;
break;
}
}
return num;
}
public function addMouseWheelListener(subscriberFunc:Function):void
{
if(getListenerIndex(subscriberFunc) == -1)
mouseWheelListeners.push(subscriberFunc);
}