function star_over(id, num) {
    for (var i = 1; i <= num; i++)
        if (i <= num)
            document.getElementById("star-" + id + "-" + i).src = "/images/starRed.png";
        else
            document.getElementById("star-" + id + "-" + i).src = "/images/starGrey.png";
}
function star_out(id, num) {
    for (var i = 1; i <= 5; i++)
        if (i <= num)
            document.getElementById("star-" + id + "-" + i).src = "/images/starGold.png";
        else
            document.getElementById("star-" + id + "-" + i).src = "/images/starGrey.png";
}
function star_click(id, num) {
    for (var i = 1; i <= 5; i++)
        if (i <= num)
            document.getElementById("star-" + id + "-" + i).src = "/images/starRed.png";
        else
            document.getElementById("star-" + id + "-" + i).src = "/images/starGrey.png";
}