Javascript Related

Hi...
I have one login jsp where where I put one link for"select uer". After clicking the link a list of userId appears with radio buttons. My code is working till here but now I have to put the selected userid at the username and thn user will enter password.
My code goes like this..jsp page:
<table align="center">
<logic:present name="UserForm" property ="userList">
<logic:iterate id="iSummary" name="UserForm" property="userList" indexId="index">
<bean:define id="user" name="iSummary" type="com.app.vo.UserVO"/>
<tr>
<td><html:radio property="userId" name="UserForm" value="<%=user.getUserId() %>" />&nbsp;&nbsp;</td>
<td><bean:write name="user" property="userName"/></td>
</tr>
</logic:iterate>
</logic:present>
<tr><td>&nbsp;</td></tr>
<tr><td><html:button property="okButton" value="OK" onclick="get_radio_value()"/>
</td></tr>
</table>

can anybody tell me how I can proceed further...
here in this code I am iterating userId and from this userId list i hv to select one user at a time and put it into userName field of login form...

Thanks in advance......

This is a Java forum; Javascript is something else entirely. Sorry...

(as the OP discovered when posting the same question in the Sun Java fora).