aggiungere valore della checkbox al totale

[andy_s]

riprovo...posto il codice
purtroppo non so come fare....
per qualcuno di voi sarà semplice...ma non per me
come scritto sopra io "dovrei" sommare il valore del checkbox (o radiobutton)
al valore del totale
ossia se premo italia1 > 16 euro >>>> al totale dovrei sommare 16 euro

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            <FORM id=form name=form action=validateOrder.asp method=post>
            

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            <TABLE cellSpacing=3 cellPadding=3 width="100%" border=1>
              <TBODY>
              <TR>
                <TD bgColor=#8a651d colSpan=2><FONT 
                  style="BACKGROUND-COLOR: #8a651d" face=Verdana color=#ffffff 
                  size=2>Condizioni di trasporto</FONT></TD></TR>
              <TR>
                <TD><FONT face=Verdana size=2>Italia1</FONT></TD>
                <TD noWrap><FONT face=Verdana size=2><INPUT id=strItalia1 
                  type=radio value=strItalia1 name=radiobutton> 
                  <LABEL></LABEL><FONT color=#000000>Euro 
                  16,00 </FONT></FONT></TD></TR>
              <TR>
                <TD><FONT face=Verdana size=2>Italia3</FONT></TD>
                <TD><FONT face=Verdana color=#333333 size=2><INPUT 
                  id=strItalia3 type=radio value=si name=radiobutton> Euro 
                  10,00 </FONT></TD></TR>
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                <TD align=middle colSpan=2></TD></TR></TBODY></TABLE>
            <TABLE cellSpacing=3 cellPadding=3 width="100%" border=1>
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                <TD vAlign=center noWrap align=left colSpan=2><FONT 
                  style="BACKGROUND-COLOR: #8a651d" face=Verdana color=#ffffff 
                  size=2>Quantità</FONT></TD>
                <TD vAlign=center align=left><FONT 
                  style="BACKGROUND-COLOR: #8a651d" face=Verdana color=#ffffff 
                  size=2>Descrizione</FONT></TD>
                <TD vAlign=center noWrap align=left><FONT 
                  style="BACKGROUND-COLOR: #8a651d" face=Verdana color=#ffffff 
                  size=2>Prezzo
Unitario</FONT></TD>
                <TD vAlign=center noWrap align=left width="10%"><FONT 
                  style="BACKGROUND-COLOR: #8a651d" face=Verdana color=#ffffff 
                  size=2>Prezzo
complessiva</FONT></TD></TR>
              <TR>
                <TD vAlign=center noWrap align=left colSpan=2><FONT 
                  face=Verdana size=2><%= intQuant %><INPUT type=hidden 
                  value="<%= intQuant %>" name=quantita> </FONT></TD>
                <TD vAlign=center noWrap align=left><FONT face=Verdana size=2><%= strProdName %><INPUT type=hidden 
                  value="<%= strProdName %>" name=prodotto> </FONT></TD>
                <TD vAlign=center noWrap align=right><FONT face=Verdana 
                  size=2>&#8364;<%= intPrice %></FONT></TD>
                <TD vAlign=center noWrap align=right><FONT face=Verdana 
                  size=2>&#8364;<%= intExtPrice %></FONT></TD></TR><INPUT type=hidden 
              value="<%= intProdID %>,<%= intQuant 			%>" 
              name=strOrderItem> 
              <TR>
                <TD vAlign=center noWrap align=left colSpan=4><FONT 
                  face=Verdana size=2>Totale Merce</FONT></TD>
                <TD vAlign=center noWrap align=right><FONT face=Verdana 
                  size=2>&#8364;<%= formatNumber(intTotal, 2) %> </FONT></TD></TR>
              <TR>
                <TD vAlign=center noWrap align=left colSpan=4><FONT 
                  face=Verdana size=2>Trasporto</FONT></TD>
                <TD vAlign=center noWrap align=right><FONT face=Verdana 
                  size=2>&#8364; <INPUT type=hidden 
                  value="<%= formatNumber((intTotal * .20), 2) %>" 
                  name=intShipping> </FONT></TD></TR>
              <TR>
                <TD vAlign=center noWrap align=left colSpan=4><FONT 
                  face=Verdana size=2>[B]Totale ordine[/B]</FONT></TD>
                <TD vAlign=center noWrap align=right><FONT face=Verdana 
                  size=2>[B]&#8364;<%= formatNumber((intTotal*1.20), 2) %> <INPUT 
                  type=hidden value="<%= formatNumber((intTotal * 1.20), 2) %>" 
                  name=intTotal> [/B]</FONT></TD></TR></TABLE>
            </FORM></TD></TR></TABLE></TD></TR>
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