function show_banner()
{
    var img_name = new Array("http://www.opry.com/img/banners/GameBanner728x90.gif");
    var img_link = new Array("http://www.oprychallenge.com");
    var img_alt = new Array("");
    var img_win = new Array(" target=\"_blank\"");

    var l = img_name.length;

    var rnd_no = Math.floor(l*Math.random());

    document.write('<a href="' + img_link[rnd_no] + '"' + img_win[rnd_no] + '><img src="' + img_name[rnd_no] + '" alt="' + img_alt[rnd_no] + '"></a>');
}