$(document).ready(function(event){
    $('div#stage_showcase blockquote[stage=stage_1]').addClass('current');

    $('span.stages a').click(function(event){
        $('span.stages a').removeClass('current');
        $(this).addClass('current');
    
        $('div#stage_showcase blockquote').removeClass('current');
        $('div#stage_showcase blockquote[stage='+$(this).attr('stage')+']').addClass('current');
    });
});