Countdown timer?

Question

How do you make a Countdown timer?

When the user loads the page, clock starts counting down, it reaches time, it redirects browser to a new page.

Found this,

Answer 1

with pure javascript you could do it like this

window.onload=function(){ // makes sure the dom is ready
  setTimeout('function(){document.location = "http://www.google.com"}', 10000) // redirects you to google after 10 seconds
}