Flash CS5.5 AS2 Key question

onClipEvent (enterFrame) {
if (Key.isDown(65)) {
this.gotoAndStop(“attack1”);

The problem is, when i press letter “a” (key.isDown(65)"" it will animate “attack1” but it will not finish the animation unless i hold the button… i wanted it to just one push and it will automatically finish the frames without holding button “a”,

this is just for now