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private function init():void{
pre.source = "A.png";
pre.addEventListener(MouseEvent.ROLL_OVER,pre_over);
pre.addEventListener(MouseEvent.ROLL_OUT,pre_out);
}
private function pre_over(event:MouseEvent):void{
if(pre.source == "A.png"){
pre.source = "B.png";
}
}
private function pre_out(event:MouseEvent):void{
if(pre.source == "B.png"){
pre.source = "A.png";
}
}