bullet = new Array();
bullet[0] = new Image(13,10); 
bullet[0].src = "/images/bullet_off.gif"; 
bullet[1] = new Image(13,10);
bullet[1].src = "/images/bullet_on.gif";

function bulletOn(img,alt) {
    window.status=alt;
    img.src = bullet[1].src;
    return true;
}

function bulletOff(img){
    window.status='';
    img.src = bullet[0].src;
    return true;
}