function sayHello()
{
 var now = new Date();
 var hours = now.getHours()
 var divider = ":";
 if (now.getMinutes()<10) divider = ":0";
 var time = ""+hours + divider + now.getMinutes();
 document.write
 if (hours<5 || hours>23) document.write("Доброй ночи!");
 else if (hours<12) document.write("Доброе утро!");
 else if (hours>16) document.write("Добрый вечер!");
 else document.write("Добрый день!");
}