// email

function checkEmail (strng) {
var error="";
if (strng == "") {
   error = "Inserisci un indirizzo e-mail.\n";
}

    var emailFilter=/^.+@.+\..{2,3}$/;
    if (!(emailFilter.test(strng))) { 
       error = "Per favore inserisci un indirizzo e-mail valido.\n";
    }
    else {
//test email for illegal characters
       var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/
         if (strng.match(illegalChars)) {
          error = "Per favore inserisci un indirizzo e-mail valido\n";
       }
    }
return error;    
}


// phone number - strip out delimiters and check for 10 digits

function checkPhone (strng) {
var error = "";
if (strng == "") {
   error = "Inserisci il numero di telefono. Ci servirà per contattarti in caso di vittoria.\n";
}

var stripped = strng.replace(/[\(\)\.\-\ ]/g, ''); //strip out acceptable non-numeric characters
    if (isNaN(parseInt(stripped))) {
       error = "Il numero telefonico contiene caratteri non validi.\n";
  
    }
return error;
}


// password - between 6-8 chars, uppercase, lowercase, and numeral

function checkPassword (strng) {
var error = "";
if (strng == "") {
   error = "You didn't enter a password.\n";
}

    var illegalChars = /[\W_]/; // allow only letters and numbers
    
    if ((strng.length < 6) || (strng.length > 8)) {
       error = "The password is the wrong length.\n";
    }
    else if (illegalChars.test(strng)) {
      error = "The password contains illegal characters.\n";
    } 
    else if (!((strng.search(/(a-z)+/)) && (strng.search(/(A-Z)+/)) && (strng.search(/(0-9)+/)))) {
       error = "The password must contain at least one uppercase letter, one lowercase letter, and one numeral.\n";
    }  
return error;    
}    


// username - 4-10 chars, uc, lc, and underscore only.

function checkUsername (strng) {
var error = "";
if (strng == "") {
   error = "You didn't enter a username.\n";
}


    var illegalChars = /\W/; // allow letters, numbers, and underscores
    if ((strng.length < 4) || (strng.length > 10)) {
       error = "The username is the wrong length.\n";
    }
    else if (illegalChars.test(strng)) {
    error = "The username contains illegal characters.\n";
    } 
return error;
}       


// non-empty textbox

function isEmpty(strng) {
var error = "";
  if (strng.length == 0) {
     error = "Per favore compila tutti i campi per poter partecipare.\n"
  }
return error;	  
}

// was textbox altered

function isDifferent(strng) {
var error = ""; 
  if (strng != "Can\'t touch this!") {
     error = "You altered the inviolate text area.\n";
  }
return error;
}

// exactly one radio button is chosen

function checkRadio(checkvalue) {
var error = "";
   if (!(checkvalue)) {
       error = "Per favore controlla la tua scelta su Maschio-Femmina.\n";
    }
return error;
}

// valid selector from dropdown list

function checkDropdown(choice) {
var error = "";
    if (choice == 0) {
    error = "Per favore inserisci la tua data di nascita.\n";
    }    
return error;
}    

function checkform ( theForm )
{
	var why = "";
	why += isEmpty(theForm.dati_nome.value);
	if (why != "") {
       alert(why);
       return false;
    } else {
		var why = "";
	}	
	why += isEmpty(theForm.dati_cognome.value);
    if (why != "") {
       alert(why);
       return false;
    } else {
		var why = "";
	}	
    why += checkEmail(theForm.dati_email.value);
    if (why != "") {
       alert(why);
       return false;
    } else {
		var why = "";
	}	
	why += checkPhone(theForm.dati_cellulare.value);
    if (why != "") {
       alert(why);
       return false;
    } else {
		var why = "";
	}	
	why += isEmpty(theForm.dati_habbo.value);
    if (why != "") {
       alert(why);
       return false;
    } else {
		var why = "";
	}	
	
	for (i=0, n=theForm.dati_sesso.length; i<n; i++) {
        if (theForm.dati_sesso[i].checked) {
            var checkvalue = theForm.dati_sesso[i].value;
            break;
        } 
    } 
    why += checkRadio(checkvalue);
    if (why != "") {
       alert(why);
       return false;
    } else {
		var why = "";
	}	
	
	why += checkDropdown(theForm.dati_nascita_giorno.selectedIndex);
	if (why != "") {
       alert(why);
       return false;
    } else {
		var why = "";
	}	
	
	why += checkDropdown(theForm.dati_nascita_mese.selectedIndex);
	if (why != "") {
       alert(why);
       return false;
    } else {
		var why = "";
	}	
	why += checkDropdown(theForm.dati_nascita_anno.selectedIndex);
    if (why != "") {
       alert(why);
       return false;
    }
	
	return true;
}