Order form.

[mario19xx]

Salve!

Ho questo order form recuperato in internet che vorrei modificare e adeguare per il mio sito.

<form method="post" action="cart.php"> 

<input type="hidden" name="gioco" value="Call of Duty"> 

  

<div align=center><table><tr><td>[b]Game[/b]</td><td> 

<select name="game" id="gametype" onChange="changePrice();" style="width:175px"> 

                                <option value="cod2">Call of Duty 2</option> 

                                  <option value="cod4">Call of Duty 4</option> 

                                <option value="cod5">Call of Duty 5</option> 

                                <option value="cod6">Call of Duty 6</option> 

                                <option value="cod8">Call of Duty MW3</option> 

                                <option value="cs">Counter Strike</option> 

                                <option value="css">Counter Strike: Source</option> 

                                <option value="css">San Andreas MP</option> 

  

                    </select></td></tr><tr><td> 

                    [b]Slots[/b]</td><td> 

                    <select name="player" id="player" onChange="changePrice();" style="width:175px"> 

                                <option value="10">10 Slots</option> 

                                <option value="12">12 Slots</option> 

                                <option value="14">14 Slots</option> 

                                <option value="16">16 Slots</option> 

                                <option value="18">18 Slots</option> 

                                <option value="20">20 Slots</option> 

                                <option value="22">22 Slots</option> 

                                <option value="24">24 Slots</option> 

                                <option value="26">26 Slots</option> 

                                <option value="32">32 Slots</option> 

  

  

                    </select></td></tr><tr><td> 

  

[b]Tipo Server[/b]</td><td> 

        <select name="type" id="type" onChange="changePrice();" style="width:175px"> 

                                 <option value="2">Pubblico</option> 

                                <option value="1">Privato</option> 

                    </select></td></tr><tr><td> 

  

[b]Tag GameHost.it[/b]</td><td> 

<select id="tag" name="tag" onChange="changePrice();" style="width:175px"> 

<option value="0">Prima il nome</option> 

<option value="1">Dopo il nome</option> 

<option value="3">No</option> 

</select> 

</td></tr><tr><td> 

[b]Durata[/b]</td><td> 

<select id="period" name="period" onChange="changePrice();" style="width:175px"> 

                         

                                <option value="270">Trimestrale (-10%)</option> 

                                <option value="510">Semestrale (-15%)</option> 

                                <option value="900">Annuale (-25%)</option> 

                    </select> 

</td></tr><tr><td> 

[b]Location[/b]</td><td> 

        <select id="locationserver" name="location" onChange="changePrice();" style="width:175px"> 

                        <option value="mln">Milano</option> 

                        <option value="prg">Parigi</option> 

                    </select> 

</td></tr></table> 



</div>
 

<center>[b]Prezzo  &euro;[/b] 

<input name="totalprice" id="totalprice" type="text" style="background: #FFF;" onFocus="this.blur()" value="16" size=10>      

 

<input name="invio" style="background-color: #FFF; border: Solid 1px #DDD; font-weight: bold;" type="submit" style="background: #FFF;" value="Aggiungi al carrello" size=10> 

 </center> 

 

</form> 

<script language="JavaScript" type="text/JavaScript"> 

function roundNumber(num, dec) { 

        var result = Math.round(num*Math.pow(10,dec))/Math.pow(10,dec); 

        return result; 

  

} 

function changePrice() 

{ 

  

var totalt = document.getElementById("totalprice"); 

var slot = document.getElementById("player"); 

var period = document.getElementById("period"); 

var type = document.getElementById("type"); 

var tag = document.getElementById("tag"); 

slot = parseFloat(slot[slot.selectedIndex].value); 

type = parseFloat(type[type.selectedIndex].value); 

tag = parseFloat(tag[tag.selectedIndex].value); 

period=parseFloat(period[period.selectedIndex].value); 

totalt.value=  roundNumber((slot+type+tag)/100*period,2); 

} 

</script> 

</div> 

In pratica devo stabilire il prezzo a slot a seconda del gioco che viene selezionato. Come si puo fare?