var today = new Date();
var BigDay = new Date("April 2, 2006 00:00:00")
var gap = BigDay.getTime() - today.getTime();
daysLeft = Math.floor(gap/1000/60/60/24);
hrsLeft = Math.floor(gap/1000/60/60 - (24*daysLeft));
minsLeft = Math.floor(gap/1000/60 - (24*60*daysLeft) - (60*hrsLeft));
secsLeft = Math.floor(gap/1000 - (24*60*60*daysLeft) - (60*60*hrsLeft) - (60*minsLeft));

function countDown() {
document.write(daysLeft +" days, " + hrsLeft +" hours, " + minsLeft +" minutes and " + secsLeft +" seconds" +".");
}