package {
    import flash.display.Sprite;
    import flash.errors.ScriptTimeoutError;

    public class ScriptTimeoutErrorExample extends Sprite {        
        private var keepLooping:Boolean = true;

        public function ScriptTimeoutErrorExample() {
            try {
                lockMachine();
            } 
            catch(e:ScriptTimeoutError) {
                trace(e);    // ScriptTimeoutError: Error #1502: A script has executed for longer than 15 seconds
                keepLooping = false;
            }
        }
        
        private function lockMachine():void {
            while(keepLooping){        
            }
        }
    }
}