Java EE (Java Enterprise Edition) General Discussion

hi!

i just want to ask if it is possible to use the getElementById method if my radio button id is a variable? i need to get the value of the radio button that the user will select.here is my code for radio button:

<% int num=2;
for (int i=0;i<=num;i++){
String radioid = "radio" + i;
%>

<TR><TD><input type=radio id="<%=radioid %>" name=rtraining value="<tracking:displayTraining />" onclick="check()">hello</TD></TR>
<%
} %>

and here is my javascript function:

function check()
{
var rvalue = document.getElementById();

if (rvalue!=null){
document.write(rvalue.innerHTML);
}else{
document.write("Error!");}
}

if you can give me another way to get the radiobutton value, that will be a big help.

please help me.im just new to java.

any response is very much appreciated. thank you!