怒られちゃった（´･ω･｀）控え目に…ｗ
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE></TITLE>
<META http-equiv=Content-Type content="text/html; charset=shift_jis">
<BODY>
<script type="text/javascript">
window.onload=function(){
var flag=Boolean(document.uniqueID)
var Col_Radio=document.getElementById("ElmSPAN").getElementsByTagName("INPUT");
for (var i=0;i<Col_Radio.length;i++){
if (flag){Col_Radio[i].onfocus=check;}else{Col_Radio[i].onclick=check;}
}}
function check() {
if(confirm('確認ダイアログ')){
this.checked=true;return true;
}else{return false;} }
</script>
<FORM method="post" name="myFORM">
<span id="ElmSPAN">
<INPUT type="radio" CHECKED value="A" name="RadioBtn">Ａ　
<INPUT type="radio" value="B" name="RadioBtn">Ｂ　
<INPUT type="radio" value="C" name="RadioBtn">Ｃ
</span>
</FORM>
</BODY></HTML>