need a little help with attaching movie clip

working on a little game where you plant bombs when pressing spacebar

here is the code

Code:
	if (Key.isDown(Key.SPACE)) {
		i++;
		var newname = "bomb"+i;
		attachMovie("bomb", "bomb"+i, this.getNextHighestDepth());
		_root[newname]._y = _root.hero._y;
		_root[newname]._x = _root.hero._x;
		_root[newname].onEnterFrame = function() {
this works fine just one problem, the newly attached movieclip now follows the character movieclip... how can i stop this, but still have the bomb place in the characters position?

also is there away i can make it attack a limited amount of bombs

please help

thank you