如何在onchange事件后某个文本框得到焦点？

<script language="javascript">
function focus123()
{

document.getElementsByName("style").focus();

}
</script>

<select onChange="window.location.href=this.value;focus123()">
<option value="华美">华美</option>
<option value="阿哆诺斯">阿哆诺斯</option>
</select>

<input type="text" name="style" id="style" />

请拷贝以上页面试试 为什么我选了列表框里一个东西后 文本框style得不到焦点呢？
<script language="javascript">
function focus123()
{
var brand=getElementById("brand").value;
window.location.href="test.asp?brand="+brand;
document.getElementById("style").focus();

}
</script>

<select name="brand" id="brand" onChange="focus123()">