单选框控制表单的隐藏和显示

<script type="text/javascript">
function show(){	
    document.getElementById("test").style.display = "block";
}
function hide(){	
    document.getElementById("test").style.display = "none";
}
</script>
<input type="radio" name="group1" value="yes" onchange="show()" />显示<input type="radio" name="group1" value="no" onchange="hide()" />不显示<div id="test" style="display:none">	
    <input type="text" />
</div>