Timed redirection

Is there a way to programmatically add timed redirection to a page? I have a page with a form on it. Once it's submitted and the data is updated in the database correctly, I'd like to present a status page then wait for say 3 seconds before redirecting them to some other URL. I know you can do this with window.location = 'targetURL' but not sure how to add it. I was thinking that it might have to be added to the header, but I'm using the same header template for each page. Any ideas? TIA, Jim