function CheckBlank() {
Selected = -1
for (var j=0; j < document.frmPension.radiobutton.length; j++)
{
if (document.frmPension.radiobutton[j].checked) {
Selected = j;
var rad_val = document.frmPension.radiobutton[j].value;
//alert(rad_val)
}
}

if (Selected == -1) {
alert("Please Select the Option\n");
return false;
}

document.frmPension.method="post"
if (rad_val == 'RefNo' )
{document.frmPension.action="pensionNag.asp"}
else if (rad_val == 'Name')
{ document.frmPension.action="pensionNagB.asp" }
document.frmPension.submit() 
}