function getCookie(NameOfCookie)
{
if (document.cookie.length > 0)
{
begin = document.cookie.indexOf(NameOfCookie+"=");
if (begin != -1)
{
begin += NameOfCookie.length+1;
end = document.cookie.indexOf(";", begin);
if (end == -1) end = document.cookie.length;
return unescape(document.cookie.substring(begin, end));
}
}
return null;
}
function setCookie(NameOfCookie, value, expiredays)
{
var ExpireDate = new Date ();
ExpireDate.setTime(ExpireDate.getTime() + (expiredays * 24 * 3600 * 1000));
document.cookie = NameOfCookie + "=" + escape(value) + ((expiredays == null) ? "" : "; expires=" + ExpireDate.toGMTString());
}
function delCookie (NameOfCookie)
{
if (getCookie(NameOfCookie))
{
document.cookie = NameOfCookie + "=" + "; expires=Thu, 01-Jan-70 00:00:01 GMT";
}
}
function DoCookie()
{
username=getCookie('username');
if (username!=null)
{
document.getElementById("ContenitoreBenvenuto").innerHTML='Benvenuto/a caro/a '+username+' su A Passion Called Linux!!!'
}
else
{
username=prompt('Ciao Benvenuto/a su A Passion Called Linux - Per favore inserisci il tuo nome.',"");
setCookie('username',username,365);
DoCookie();
}
}
<body onLoad="DoCookie()">
<div id="ContenitoreBenvenuto" align="center"></div>