Get value of selected radio input button in Masterpage

Try this:

for (var i=0; i < document.formname.rPaymentMethod.length; i++)
   {
   if (document.formname.rPaymentMethod[i].checked)
      {
      var RadioValue = document.formname.rPaymentMethod[i].value;
      }
   }

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http://www.somacon.com/p143.php

<input id="rCreditCard" runat="server" type="radio" name="rPaymentMethod" value="CreditCard" onclick="javascript:RequestorTypeCreditCard();" />CreditCard
<input id="rPayPal" runat="server" type="radio" name="rPaymentMethod" value="PayPal" onclick="javascript:RequestorTypePayPal(); />PayPal

function RequestorTypeCreditCard()
{
document.Getelementid("RequestorType").item(0).value = True;
document.getElementById("CreditClick").value = "Y";
document.getElementById("paypalclick").value = "N";
somecode...............
}

Can you try this.

full sample:

<script>
function getRadioValue(rgName){
  var rbList = document.getElementsByName(rgName);
  for (i=0;i<rbList.length;i++) if (rbList[i].checked) return rbList[i].value;
}
function chkPayment(){
  var payment = getRadioValue("rPaymentMethod");
  alert(payment);
}
</script>

<input id="rCreditCard" runat="server" type="radio" name="rPaymentMethod" value="CreditCard" />CreditCard
<input id="rPayPal" runat="server" type="radio" name="rPaymentMethod" value="PayPal" />PayPal 

<button onClick="chkPayment()">Test</button>

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