function set_cookie(name, value, days) {
     if (days) {
          var date = new Date();
          date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
          var expires = "; expires=" + date.toGMTString();
     } else {
		 var expires = "";
	 }
     document.cookie = name + "=" + value + expires + "; path=/; domain=.zib.com.ua";
}

function clear_cookie(name) {
	set_cookie(name, 0, -1);
}