Sticky Scrolling

gistfile1.js

    $(document).ready(function(){
     function sticky() {
      var y = $(window).scrollTop();
      if( y > (60) ){
          $('.postnav').css({
              'position': 'fixed',
              'top': '0',
              'left': ($(window).width() - $('.container').width())/2 - 10
          });
      } else {
          $('.postnav').removeAttr('style');
      }
     };

     $(window).scroll(sticky);
     $(window).resize(sticky);
    });

Credit for this goes to http://twitter.com/#!/_dte