datetoday = new Date();
timenow=datetoday.getTime();
datetoday.setTime(timenow);
thehour = datetoday.getHours();
if (thehour >18) display = "Guten Abend";
else if (thehour >10) display = "Herzlich Willkommen";
else display = "Guten Morgen";
var greeting = (""+display+"");
document.write(greeting);