Questo è il mio form in html

Codice PHP:
<form id="doublecombo" action="mail_privati.php" method="post" name="doublecombo" enctype="Predefinito">
<
table width="743" border="0" cellspacing="0" cellpadding="0" height="684">
    <
tr height="143">
        <
td colspan="2" align="left" valign="top" width="745" height="143">
<
div style="padding-right:10px;padding-left:10px;">
<
table width="400" border="0" cellspacing="0" cellpadding="0">
    <
tr height="100">
        <
td align="center" valign="bottom" width="120" height="100">[img]immagini/box-fisso.jpg[/img]</td>
        <
td align="center" valign="bottom" width="20" height="100"></td>
        <
td align="center" valign="bottom" width="120" height="100">[img]immagini/box-pantografo.jpg[/img]</td>
        <
td align="center" valign="bottom" width="20" height="100"></td>
        <
td align="center" valign="bottom" width="120" height="100">[img]immagini/box-chiocciola.jpg[/img]</td>
</
tr>
    <
tr height="25">
        <
td align="center" bgcolor="#ffcc01" width="120" height="25">
<
div align="center"><font color="black" face="Tahoma" size="2">Box Fisso</font></div></td>
        <
td align="center" width="20" height="25"></td>
        <
td align="center" bgcolor="#ffcc01" width="120" height="25"><font color="black" face="Tahoma" size="2">Box Pantografo</font></td>
        <
td align="center" width="20" height="25"></td>
        <
td align="center" bgcolor="#ffcc01" width="120" height="25"><font color="black" face="Tahoma" size="2">Box Chiocciola</font></td>
</
tr></table>
</
div></td></tr>
<
tr height="17">
        <
td valign="top" width="301" height="17">
<
div style="padding-right:10px;padding-left:10px;">
<
table width="273" border="0" cellspacing="0" cellpadding="0">
    <
tr height="30">
        <
td width="98" height="30"><font size="1" color="white" face="Verdana">Modello</font></td>
        <
td width="61" height="30"><select name="example" size="1" onChange="redirect(this.options.selectedIndex)">
        <
option value="null">--seleziona--</option>
        <
option>Fisso</option>
        <
option>Pantografo</option>
        <
option>Chiocciola</option>
</
select></td>
    </
tr>
    <
tr height="30">
        <
td width="98" height="30"><font size="1" color="white" face="Verdana">Dimensioni</font><font size="1" color="black" face="Verdana">aaaa</font></td>
        <
td width="61" height="30"><select name="stage2" size="1">
<
option value="null">Lungh.xLargh.xAltezza=Euro</option>
    </
select></td>
    </
tr>
    <
tr height="30">
        <
td width="98" height="30"><font size="1" color="white" face="Verdana">Tessuto</font></td>
        <
td width="61" height="30"><select name="Tessuto" size="1">
<
option value="Crema 20">Crema 20</option>
<
option value="Corda 17">Corda 17</option>
<
option value="Grigio 71">Grigio 71</option>
<
option value="Bianco 10">Bianco 10</option>
<
option value="Verde 04">Verde 04</option>
</
select></td>
</
tr>
         <
tr height="30">
        <
td width="98" height="30"><font size="1" color="white" face="Verdana">Quantit&agrave;</font></td>
        <
td width="61" height="30"><select name="Quantita" size="1">
<
option value="1">1</option>
<
option value="2">2</option>
<
option value="3">3</option>
<
option value="4">4</option>
</
select></td>
</
tr></table></div>


<
div style="padding-right:10px;padding-left:10px;">
<
table width="281" border="0" cellspacing="2" cellpadding="0" height="106">
    <
tr height="25">
        <
td bgcolor="#ffca00" width="183" height="25"><font color="black" face="Tahoma" size="2">Optional</font></td>
        <
td bgcolor="#ffca00" width="40" height="25">
<
div align="center"><font color="black" face="Tahoma" size="2">Euro</font></div>
        </
td>
        <
td bgcolor="#ffca00" width="40" height="25"></td>
    </
tr>
    <
tr height="25">
        <
td width="183" height="25"><font color="white" face="Tahoma" size="2">Finestra in cristal cm105x70</font></td>
        <
td align="center" valign="middle" width="40" height="25"><font color="white" face="Tahoma" size="2">77</font></td>
        <
td align="center" valign="middle" width="40" height="25"><input type="checkbox" name="finestra" value="finestra"/></td>
    </
tr>
    <
tr height="25">
        <
td width="183" height="25"><font color="white" face="Tahoma" size="2">Obl&ogravemicroforato</font></td>
        <
td align="center" valign="middle" width="40" height="25"><font color="white" face="Tahoma" size="2">31</font></td>
        <
td align="center" valign="middle" width="40" height="25"><input type="checkbox" name="oblo" value="oblo"/></td>
    </
tr>
    <
tr height="25">
        <
td width="183" height="25"><font color="white" face="Tahoma" size="2">Ruota antisollevamento</font></td>
        <
td align="center" valign="middle" width="40" height="25"><font color="white" face="Tahoma" size="2">42</font></td>
        <
td align="center" valign="middle" width="40" height="25"><input type="checkbox" name="ruota" value="ruota"/></td>
    </
tr>
    <
tr height="25">
        <
td width="183" height="25"><font color="white" face="Tahoma" size="2">Guida antisollevamento</font></td>
        <
td align="center" valign="middle" width="40" height="25"><font color="white" face="Tahoma" size="2">29</font></td>
        <
td align="center" valign="middle" width="40" height="25"><input type="checkbox" name="guida" value="guida"/></td>
    </
tr>
                                        </
table>
                                        </
div>
                                    </
td>
                                    <
td valign="top" width="444" height="17">
                                        <
div style="padding-left:10px;">
                                            <
table width="427" border="0" cellspacing="0" cellpadding="0">
                                            <
tr height="30">
                                                <
td width="171" height="30"><font size="1" color="white" face="Verdana">Nome e Cognome</font></td>
                                                <
td width="261" height="30"><input type="text" name="nome" size="36" tabindex="3"/></td>
                                            </
tr>
                                            <
tr height="30">
                                                <
td width="171" height="30"><font size="1" color="white" face="Verdana">Indirizzo</font></td>
                                                <
td width="261" height="30"><input type="text" name="indirizzo" size="36" tabindex="5"/></td>
                                            </
tr>
                                            <
tr height="30">
                                                <
td width="171" height="30"><font size="1" color="white" face="Verdana">Cap Citt&agrave; - Provincia</font><font size="1" color="black" face="Verdana">aaaa</font></td>
                                                <
td width="261" height="30">
                                                        <
table width="219" border="0" cellspacing="0" cellpadding="0" height="21">
                                                            <
tr height="21">
                                                                <
td width="30" height="21"><input type="text" name="cap" size="3" maxlength="5" tabindex="6"/><font color="black"> </font></td>
                                                                <
td width="14" height="21"><font color="white"> -</font></td>
                                                                <
td align="center" width="120" height="21"><input type="text" name="citta" size="18" tabindex="7"/></td>
                                                                <
td align="center" width="26" height="21"><font size="1" color="white" face="Verdana">Pr.</font></td>
                                                                <
td align="center" width="29" height="21"><input type="text" name="provincia" size="2" maxlength="2" tabindex="8"/></td>
                                                            </
tr>
                                                        </
table>
                                                    </
td>
                                            </
tr>
                                            <
tr height="30">
                                                <
td width="171" height="30"><font size="1" color="white" face="Verdana">Telefono</font></td>
                                                <
td width="261" height="30"><input type="numeri" name="telefono" size="36" maxlength="8" tabindex="10"/></td>
                                            </
tr>
                                            <
tr height="30">
                                                <
td width="171" height="30"><font size="1" color="white" face="Verdana">Email</font></td>
                                                <
td width="261" height="30"><input type="text" name="email" size="36" maxlength="10" tabindex="19"/></td>
                                            </
tr>
                                                <
tr height="30">
                                                    <
td width="171" height="30"></td>
                                                    <
td width="261" height="30"></td>
                                                </
tr>
                                                <
tr height="30">
                                                    <
td width="171" height="30"></td>
                                                    <
td width="261" height="30"></td>
                                                </
tr>
                                            </
table>
                                        </
div>
                                    </
td>
                                </
tr>
                                <
tr height="18">
                                    <
td colspan="2" width="745" height="129">
                                    <
div style="padding-right:10px;padding-left:10px;">
                                    

                                        <
font size="1" color="white" face="Verdana">Informativa D.Lgs196/03

                                        
</font>

                                        

                                        </
div>
                                    </
td>
                                </
tr>
                                <
tr height="28">
                                    <
td colspan="2" width="745" height="28">
                                        <
div style="padding-right:10px;padding-left:10px;">
                                        <
table width="445" border="0" cellspacing="0" cellpadding="0">
                                            <
tr height="18">
                                                <
td width="160" height="18"><font size="2" color="white" face="Tahoma">Consenso al trattamento:</font></td>
                                                <
td align="right" width="107" height="18"><font size="2" color="white" face="Tahoma">Do il consenso</font></td>
                                                <
td align="center" width="30" height="18"><input type="radio" name="Consenso" value="si" checked="checked" tabindex="23"/></td>
                                                <
td align="right" width="118" height="18"><font size="2" color="white" face="Tahoma">Nego il consenso</font></td>
                                                <
td align="center" width="30" height="18"><input type="radio" name="Consenso" value="No"/></td>
                                            </
tr>
                                        </
table>
                                        </
div>
                                    </
td>
                                </
tr>
                                <
tr height="44">
                                    <
td colspan="2" align="center" valign="middle" width="745" height="44"><input type="submit" name="invia" onClick="go()" value="invia"/>
                                        <
script type="text/javascript" language="JavaScript">
<!--

var 
groups=document.doublecombo.example.options.length
var group=new Array(groups)
for (
i=0i<groupsi++)
group[i]=new Array()

group[1][0]=new Option("315x150x165 = 612 EURO")

group[2][0]=new Option("315x150x165 = 764 EURO")

group[3][0]=new Option("350x150x160 = 906 EURO")


var 
temp=document.doublecombo.stage2

function redirect(x){
for (
m=temp.options.length-1;m>0;m--)
temp.options[m]=null
for (i=0;i<group[x].length;i++){
temp.options[i]=new Option(group[x][i].text,group[x][i].value)
}
temp.options[0].selected=true
}

function 
go(){
location=temp.options[temp.selectedIndex].value
}
//-->
</script>
                                    </td>
                                </tr>
                                <tr height="25">
                                    <td colspan="2" align="center" valign="middle" width="745" height="25">
                                        <table width="274" border="0" cellspacing="0" cellpadding="0">
                                            <tr height="16">
                                                <td align="center" bgcolor="#ffcc01" width="128" height="16"><font size="2" color="white" face="Tahoma">[url="#"]Condizioni di vendita[/url]</font></td>
                                                <td bgcolor="white" width="2" height="16"></td>
                                                <td align="center" bgcolor="#ffcc01" width="142" height="16"><font size="2" color="white" face="Tahoma">[url="#"]  Condizioni di garanzia[/url]</font></td>
                                            </tr>
                                        </table>
                                    </td>
                                </tr>
                            </table>
                        </form>