Selezionare un RADIO BOTTON obbigatoriamente

[iz7auh]

Ciao a tutti, ho necessità di obbligare l'utente a selezionare almeno un RADIO BOTTON per proseguire alla pagina successiva come posso fare???


Il campo da controllare è:

<input name="DXCall" type="radio" value="<%=DXCall%>">



Ecco il codice completo del form, integra parti ASP



<form name="form1" method="get" action="/wwdxt/index1.asp#step2">
<table width="36%" border="0" align="center" cellpadding="0" cellspacing="1">
<tr>
<td width="49%" valign="top"><div align="center">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td><div align="center">
<% Dim RScallsign, SQLcallsign


SQLcallsign = " SELECT * FROM [WWDXT-CALL] ORDER BY Callsign ASC "
'Response.Write SQL
Set RScallsign = Conn.Execute(SQLcallsign)



%>
</div></td>
</tr>

<tr>
<td><div align="center">
<table width="100%" height="74" border="0" align="center" cellpadding="3" cellspacing="1" bgcolor="#000000">
<tr>
<td bgcolor="#FFFFFF"><div align="center">
<div align="center">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td bgcolor="#FFFF00"><div align="center" class="Rosso10">CHOOSE YOUR FAVORITE</div></td>
</tr>
</table>
<%
If Not RScallsign.EOF Then RScallsign.MoveFirst
Do While Not RScallsign.EoF
%>
<span class="Stile1">
<% Dim DXCall
DXCall = RScallsign("Callsign")
%>
</span>
<table width="92%" border="0" align="center" cellpadding="1" cellspacing="0">
<tr>
<td width="20%"><div align="center">
<input name="DXCall" type="radio" value="<%=DXCall%>">
</div></td>
<td width="80%"><span class="Stile1"><%=RScallsign("Callsign")%></span></td>
</tr>
<%
RScallsign.MoveNext
Loop
%>
</table>
</div>
</div></td>
</tr>
</table>
</div></td>
</tr>
</table>
</div></td>
</tr>
<tr>
<td valign="top"><div align="right">
<input type="submit" name="Submit" value="VOTE!">
</div></td>
</tr>
</table>
</form>

[var]

non potresti semplicemente proporlo selezionato per default?

<input type="radio" selected="selected" ...

ciao