Something

package {
    import flash.display.Sprite;
    import flash.events.KeyboardEvent;
    
    public class KeyCaller extends Sprite {
		public var keyval:Number=0
        function KeyCaller() {
            addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);
			addEventListener(KeyboardEvent.KEY_UP, onKeyUp);
        }
        
        private function onKeyDown(event:KeyboardEvent):void {
            keyval=event.keyCode
        }
		private function onKeyUp(event:KeyboardEvent):void{
			keyval=0
		}
    }
}