[JavaScript] Chiedi all'utente come si chiama e memorizza

<SCRIPT LANGUAGE="JavaScript">

<!--
var username = GetCookie('username');
var dom = GetCookie('MyDomain');

if (username == null) {

username = prompt('Scrivi il tuo nome',"");

if (username == null) {

alert('Se non scrivi il tuo nome, sarai Anonimo.');
username = 'Anonimo';

} else {

pathname = location.pathname;
MyDomain = pathname.substring(0,pathname.lastIndexOf('/')) +'/';


var largeExpDate = new Date ();
largeExpDate.setTime(largeExpDate.getTime() + (365 * 24 * 3600 * 1000));

SetCookie('username',username);
}

}

function getCookieVal (offset) {
var endstr = document.cookie.indexOf (";", offset);
if (endstr == -1)
endstr = document.cookie.length;
return unescape(document.cookie.substring(offset, endstr));
}
function GetCookie (name) {
var arg = name + "=";
var alen = arg.length;
var clen = document.cookie.length;
var i = 0;
while (i < clen) {
var j = i + alen;
if (document.cookie.substring(i, j) == arg)
return getCookieVal (j);
i = document.cookie.indexOf(" ", i) + 1;
if (i == 0)
break;
}
return null;
}

function SetCookie (name, value) {
var argv = SetCookie.arguments;
var argc = SetCookie.arguments.length;
var expires = (argc > 2) ? argv[2] : null;
var path = (argc > 3) ? argv[3] : null;
var domain = (argc > 4) ? argv[4] : null;
var secure = (argc > 5) ? argv[5] : false;
document.cookie = name + "=" + escape (value) +
((expires == null) ? "" : ("; expires=" +
expires.toGMTString())) +
((path == null) ? "" : ("; path=" + path)) +
((domain == null) ? "" : ("; domain=" + domain)) +
((secure == true) ? "; secure" : "");
}

document.write('<font face=arial size=4>Un grande benvenuto a '+username+' !</font> ');
//-->
</SCRIPT>