get a radio button click value

thanks sir for sending code ,but i have one probs that is i m getting a null value i m calling getParameter("id") in servlet that is used in another jsp so can i call getParameter("radio") i.e in the input tag name="radio" eventhough i m getting a null value please help me sir
thanks in advance
if an changes in the code please send me sir...
1)Home.jsp:

<%@ page import="java.sql.*"%>
<script>
function transfer(id){
var f = document.form;
f.method = "POST";
f.action = "main.jsp?id="+id;
f.submit();
}
</script>

<form name="form">
<table border=1>
<%
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/register","root","root";);
Statement st = con.createStatement();
ResultSet rs = st.executeQuery("select * from data");


while(rs.next()){
%>
<tr><td><input type="radio" name="radio" value="<%=rs.getString("id")%>" onclick="transfer(<%=rs.getString(1)%>);"></td><td><%=rs.getString("id")%></td><td><%=rs.getString("name")%></td></tr>
<%

}
}
catch(Exception e){}
%>
</table>
</form>

2) main.jsp:

<%
String id=request.getParameter("id");
out.println("id = "+id);
%>