function timeOfDayImage() {
var now = new Date;
var timeNow = now.getHours();
var img = null; var mess = '';
if (timeNow < 5 || timeNow > 23) {
img = 'header2.jpg'; mess = 'Good Night';
} else if (timeNow < 11) {
img = 'header3.jpg'; mess = 'Good Morning';
} else if (timeNow < 16) {
img = 'header4.jpg'; mess = 'Good Afternoon';
} else {
img = 'header1.jpg'; mess = 'Good Evening';
}
document.write('<img src="'+img+'" width="800" height="200" alt="'+mess+'" title="'+mess+'" />');
}