【radiobutton】
<html>
<body>
<form name="form1">
<input type="radio" name=button1>Box 1
<br>
<input type="radio" name=button2>Box 2
<br><br>
<input type="button" value="Set Focus to Box 1" onClick='document.form1.button1.focus()'>
</form>
</body>
</html>
