function gethello() {
var nowdate = new Date();
var nowtime = nowdate.getHours();
var hellostr = '';
if (nowtime>=0 &&nowtime<6) {hellostr="Доброй ночи!";}
if (nowtime>=6 &&nowtime<11) {hellostr="С добрым утром!";}
if (nowtime>=11 &&nowtime<18) {hellostr="Добрый день!";}
if (nowtime>=18) {hellostr="Добрый вечер!";}
return hellostr;
}