function bite(cupcake, page_title) {
  $("li.cupcake").removeClass("hover");
  $("li#cupcake_" + cupcake).addClass("hover");
  
  $('#page_header').fadeOut(0, function () {
    $('#page-title').html(page_title);
    $('#header_image').attr("src", "/images/headers/" + page_title + ".png");
    //$('#page_header').fadeIn(200); 
    $('#page_header').show(); 
  });
}

function unbite() {
  $("li.cupcake").removeClass("hover");
}