Does anyone know the code to have a countdown thing. Like an automated one?

Change parts in bold:

<SCRIPT LANGUAGE = "JavaScript">
var now = new Date();
// set this value to the countdown date.
var then = new Date("Month Day, Year");
var gap = then.getTime() - now.getTime();
gap = Math.floor(gap / (1000 * 60 * 60 * 24));
document.write(gap);
</SCRIPT>
day(s) 'til ???


Or maybe you like these better:
http://www.dynamicdrive.com/dynamicindex6/dhtmlcount.htm
http://www.dynamicdrive.com/dynamicindex6/dhtmlcount2.htm

Thank You so much!!

huh, do you know how to put an image for like the background?