image = new Array();
image[0] = new Image();image[0].src = "img/top0.jpg";
image[1] = new Image();image[1].src = "img/top1.jpg";
function mouse_on(n){
document.myImg.src = "img/top"+n+".jpg";
}

function mouse_off(){
document.myImg.src = image[0].src;
}