gistfile1.js

  $('.unfollow-button').live('click',function(e){
    var uid = this.id.match(/fol-(\d+)/)[1];
    var button = this;
    $.post("/unfollow/"+uid+"?ajax",{},function(data){
      $(button).removeClass('.unfollow-button').addClass('.follow-button');
    },'json');
    return false;
  });