jQuery countdown timer

Currently i have this code

setTimeout(function() { $('#hideMsg').fadeOut('fast'); }, 2000);

is it possible for me to put countdown timer for 2 seconds?

Like

<div id="hideMsg">
The entry you posted not valid.
This Box will Close In 2 Seconds
</div>

"This Box will Close In 2 Seconds" will automatically change to 2sec 1sec