RadioButton取值的问题

[health888]

请看下面的程序，十分简单。我想使用javascript根据HTML表单的radiobutton的"value"不同，而取出RadioButton的value，可为何总调试不出。那位高手能给出解决方法?

<!--webbot BOT="GeneratedScript" PREVIEW=" " startspan --><script Language="JavaScript"><!--

function CheckRadio(theForm)
{

if (theForm.test.value == "a")
{
alert("Radio Button的值为a");
}

if (theForm.test.value == "b")
{
alert("Radio Button的值为b");
}

}

//--></script><!--webbot BOT="GeneratedScript" endspan -->


<form method="POST" onsubmit="return CheckRadio(this)" action="test_Radio.php" >
<p><input type="radio" name="test" value="a" checked>a</p>
<p><input type="radio" name="test" value="b">b</p>
<p><input type="submit" value="提交" name="B1"></p>
</form>

[jsidiot]

if (theForm.test[0].checked== "a") //第一个radio
if (theForm.test[1].checked== "b") //第二个radio

[zhaoweiwei]

<form name="f1" method="POST" onsubmit="return CheckRadio(this)" action="test_Radio.php" >
<p><input type="radio" name="test" value="a" checked>a</p>
<p><input type="radio" name="test" value="b">b</p>
<p><input type="submit" value="提交" name="B1"></p>
</form>


if(f1.elements[0].checked){alert("a")}
else if(f1.elements[1].checked){alert("b")}

[health888]

OK,问题解决，偶给分痛快的说。