Automatically close a banner

Question

Hey Guys.
I'm new in JavaScript.
I have a banner in my website, the banner Id is #advt.
I need a js code to close banner after a while.
but I don't know how to use setTimeout to take action like display:none; for that banner Id.
Pls help.

Answer 1

setTimeout(function() {
$('#advt').fadeOut('fast');
}, 2000); //
or
var = document.getElementById("advt");
advt.style.display = "none";

Answer 2

Thanks, but its doesn't work.
Any suggestions?