Display countdown using javascript or jquery -

i want display countdown in html page, refreshing page should not restart countdown. can drop example?

use jquery.countdown.js

this can used as

 function setcountdown () {      $('#countdown').countdown({until: +59, format: 'yowdhms',                          layout: '{sn} {sl}', onexpiry: myfunction});     $('#countdown').removeclass ('is-countdown');     $('#countdownspan').show (); } 

where html be

<span id="countdownspan">&nbsp;<span id="countdown"></span>seconds remaining</span>