i1 = new Image(); i1.src = "../img/bullet.gif";
i2 = new Image(); i2.src = "../img/px.gif";

function _over(id) {
	document.images["bul"+id].src = "../img/bullet.gif";
}

function _out(id) {
	document.images["bul"+id].src = "../img/px.gif";
}