function validateForm(form) {
	if (form.realname.value == "") {
		alert("Errore! Campo nome vuoto");
		return false
	} 
	if (form.email.value == "") {
		alert("Errore! Campo email vuoto");
		return false
	}
	if (!isEmail(form.email.value)) {
		alert("Errore! Indirizzo Email non valido");
		return false
	}
	return true
}

function isEmail (s) {  
    var i = 1;
    while ((i < s.length) && (s.charAt(i) != "@")) { 
    	i++;
    }

    if ((i >= s.length) || (s.charAt(i) != "@")) 
    	return false;
    else i += 2;

    // look for .
    while ((i < s.length) && (s.charAt(i) != ".")) {
    	i++
    }

    // there must be at least one character after the .
    if ((i >= s.length - 1) || (s.charAt(i) != ".")) return false;
    else return true;
}

function isDigit (c) {
	return ((c >= "0") && (c <= "9"))
}