<option>輕舟已過萬重山    <<< 字句可加可減，首句留空是作間隔之用

setTimeout("rotate()",2000); 2000之值越大越慢，可隨意更改

如不能顯示語法效果可貼去本站語法測試板試看

<form name="menuform"><center><select size="1" name="msg">

    <option>
    <option>朝辭白帝彩雲間
    <option>千里江陵一日還
    <option>兩岸猿聲啼不住
    <option>輕舟已過萬重山
  </select></center></form>
<script language="javascript">
<!-- Begin
function rotate() {
menu = document.menuform.msg;
chosen = menu.selectedIndex;
menu.selectedIndex= (chosen == (menu.length-1)) ? 0 : chosen + 1;
setTimeout("rotate()",2000);
}
rotate();
-->
</script>