var star_gray_big = new Image;
    var star_red_big = new Image;
    var star_spacer_big = new Image;
    star_gray_big.src = '/images/layout/star_grey_big.gif';
    star_red_big.src = '/images/layout/star_red_big.gif';
    star_spacer_big.src = '/images/layout/star_spacer_big.gif';

    function select_stars(selected)
    {
        var i;
        var image_id;
        for (i=1; i<=selected; i++)
        {
            image_id = 'star'+i;
            obj_image = document.getElementById(image_id);
            obj_image.src = star_red_big.src;
        }
        for (i=selected+1; i<=5; i++)
        {
            image_id = 'star'+i;
            obj_image = document.getElementById(image_id);
            obj_image.src = star_spacer_big.src;
        }
    }

    function show_avg_rating(avg_rating)
    {
        var i;
        var image_id;
        for (i=1; i<=avg_rating; i++)
        {
            image_id = 'star'+i;
            obj_image = document.getElementById(image_id);
            obj_image.src = star_gray_big.src;
        }
        for (i=avg_rating+1; i<=5; i++)
        {
            image_id = 'star'+i;
            obj_image = document.getElementById(image_id);
            obj_image.src = star_spacer_big.src;
        }
    }