ASP中下拉框与文本框连动效果

<script language="javascript">

function changeValue(values)
{
        form1.T1.value=values;
}

</script>

<form name="form1" method="post" action="">
<select name="S1" onChange="changeValue(this.value)">
  <option value="A1">11</option>
  <option value="A2">22</option>
  <option value="A3">33</option>
  <option value="A4">44</option>
  <option value="A5">55</option>
</select>
<input type="text" name="T1">
</form>