ok scusatemi...
ecco l'intero codice:
codice:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
.registra {
	border:thick solid #0C3
}
form { width: 500px}
</style>
<title>Form di registrazione</title>
<script language="javascript" type="text/javascript">
function check_form(f){
	var msg="Sono stati rilevati i seguenti errori:";
	var email_pattern=/^w+@([\w.])+\w+$/;	
	var error=false;
	
	if(f.Nome.value==""){
		msg=msg+"\n Campo nome obbligatorio.";
		error=true;
		}
	if(f.Cognome.value==""){
		msg=msg+"\n Campo cognome obbligatorio.";
		error=true;
		}
	if(!email_pattern.test(f.mail.value)){
		msg=msg+"\n Campo e-mail non corretto.";
		error=true;
		}
	var i=0;
	var a_sel=false;
	while(i<f.radio.length && !a_sel)
	{
		if(f.radio.checked)
			a_sel=true;
			i++;
		}
	if(!a_sel){
		msg=msg+"\nSelezionare il posizionamento del menu";
		error=true;
		}
	if(f.Colore.selected==false){
		msg=msg+"\nSelezionare il colore di sfondo";
		error=true;
		}
	if(f.psw.value==f.Controllo_psw.value){	
		msg=msg+"\nInserire di nuovo il controllo password!!";
		error=true;
		}
	if(f.usr.value==""){
		msg=msg+"\n Campo Username obbligatorio.";
		error=true;
		}
	if(error){
		alert(msg);
		return false;
		}
	else
	{	
		if(f.radio.value==dx)
		{
		window.alert("Hai selezionato la destra");
		document.cookie+="Align: destra"
		}
		if(f.radio.value==sx)
				document.cookie+="Align: sinistra"
		if(f.radio.value==center)
			document.cookie+="Align: centro"
		
		var date = new Date();
		date.setTime(date.getTime()+(7*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
		
		document.cookie="coockie=c"+expires+"; path=/";
		document.cookie="name="+escape(Nome)+"Cognome="+escape(Cognome)+"Mail="+escape(mail)+"sfondo="+
		escape(Color)+"DimCar="+escape(DimCar)+"ColCar="+escape(Colore2)+"Usr"+escape(usr)+" Password="+escape(psw);	
		return true;
	}
}
function answer(f){
	var cookieTokens = mycookie.split(";");
	
	switch(mycookie[4])
	{
		case "dx":
			document.URL="FrameDx";
			break;
		case "sx":
			document.URL="FrameSx";
			break;
	}
	document.URL="menu.html"
}
</script>
</head>

<body>
<form name="Reg" action="javascript:answer(document.Reg)" method="post" target="_top" id="Reg" onsubmit="return(check_form(this))">
  <div class="registra"> 
    

Nome:
      <input name="Nome" type="text" maxlength="30" />
    </p>
    

Cognome:
      <input name="Cognome" type="text" maxlength="30" />
    </p>
    

E-mail:
      <input name="mail" type="text" maxlength="30" />
    </p>
    <p align="center">Seleziona le tue preferenze sulla pagina:</p>
    

    
	  <label>
        Colore sfondo	
      </label>
        <select name="Colore" id="Colore" >
        <option>Rosso</option>
        <option>Giallo</option>
        <option>Verde</option>
        <option>Nero</option>
        <option>Rosa</option>
        <option>Marrone</option>
        <option>Blu</option>
        <option>Viola</option>
        <option>Bianco</option>
        </select>
    </p>    
        <p align="center">Carattere:
</p>
    

    
        Dimenzioni:
        <select name="DimCar" id="DimCar">
          <option>9</option>
          <option>10</option>
          <option>12</option>
          <option>14</option>
          <option>16</option>
          <option>18</option>
          <option>20</option>
          <option>22</option>
          <option>24</option>
          <option>26</option>
          <option>28</option>
          <option>30</option>
          <option>32</option>
          <option>34</option>
          <option>36</option>
          <option>38</option>
          <option>40</option>
        </select>
        Tipo:
        <select name="Tipo" id="Tipo">	
          <option>Arials</option>
          <option>Comic Sans</option>
          <option>Times new roman</option>
        </select>
        Colore
         <select name="Colore2" id="Colore2">
           <option>Arancione</option>
           <option>Blu</option>
           <option>Giallo</option>
           <option>Marrone</option>
           <option>Nero</option>
           <option>Oro</option>
           <option>Rosa</option>
           <option>Rosso</option>
           <option>Verde</option>
           <option>Viola</option>
         </select>
	  </label>
    </p>
    <p align="center" >Posizione del menu:</p>
    <p align="center">
      <label>
        <input type="radio" name="radio" id="dx" value="dx" />
        destra</label>
      <label>
        <input type="radio" name="radio" id="sx" value="sx" />
        sinistra</label>
      <label>
        <input type="radio" name="radio" id="center" value="center" />
        centro</label>
    </p>
    <p align="center">Dati di registrazione:</p>
    


      <label>Username
        <input type="text" name="usr" id="usr" />
      </label>
    </p>
    


      <label>Password:
        <input type="password" name="psw" id="psw" />
      </label>
    </p>
    


      <label>Inserire nuovamente password:
        <input type="password" name="Controllo psw" id="Controllo psw" />
      </label>
    </p>
    <p align="center">
      <label>
        <input type="submit" name="Invia" id="Invia" value="Registra" />
      </label>
    </p>
  </div>
</form>
</body>
</html>