Game Firing problem with key.isDown

I looked at the tutorial on how to fire in a game (http://www.kirupa.com/developer/mx/fire.htm) , and tried to replace the clicking the button to hitting the Z button, so it looks like this

This is the code on pressing the key:
onEnterFrame = function(){
if (Key.isDown(90)){
_root.fire = 1;
_root.i += .1;
duplicateMovieClip(_root.bullet, "bullet"+i, i);
}

}

And this is the code on the bullet:
onClipEvent (load) {
this._visible = 0;
if (_root.fire == 1) {
this._x = _root.player._x;
this._y = _root.player._y;
}
}
onClipEvent (enterFrame) {
if (this != _level0.bullet) {
if (_root.fire == 1) {
this._y -= 10;
this._visible = 1;
}
if (this._y<0) {
this.removeMovieClip();
}
}
..basically the same except replacing "crab" with "player"..

Now the problem is, when i release the key an extra bullet fires off, and then when i press Z again,that bullet dissappears in mid-air every other time, so is there a way to get that last bullet to just not fire off and be removed?

http://www.kirupaforum.com/forums/showthread.php?s=&threadid=38864&highlight=shoot+game

take a look at the code for shooting, claudio has an attatchment.

_root.i += .1;
duplicateMovieClip(_root.bullet, "bullet"+i, i);

try making this a + 1 instead of a + .1

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8 January 2009 | cameltoepants.com | edit