var ads = new Array();
ads[ads.length] = "<TR><TD height='65'><A href='banner/banner01.htm' target='_blank'><IMG src='banner/01.gif' width='120' height='60' border='0'></A></TD></TR>";
ads[ads.length] = "<TR><TD height='65'><A href='banner/banner02.htm' target='_blank'><IMG src='banner/02.jpg' width='120' height='60' border='0'></A></TD></TR>";
ads[ads.length] = "<TR><TD height='65'><A href='banner/banner04.htm' target='_blank'><IMG src='banner/04.gif' width='120' height='60' border='0'></A></TD></TR>";
ads[ads.length] = "<TR><TD height='65'><A href='banner/banner05.htm' target='_blank'><IMG src='banner/05.gif' width='120' height='60' border='0'></A></TD></TR>";

function write_ad() {
document.write("<TABLE>")
    shuffle(ads);
    for (var i = 0; i < 4; i++) {
      document.write(ads[i]);
    }
document.write("</TABLE>")
}

function shuffle(array) {
    for (var i = array.length; --i; ) {
      var r = Math.floor(Math.random() * (i+1));
    if (r != i) {
      var tmp = array[i];
      array[i] = array[r];
      array[r] = tmp;
    }
  }
}