text: var height = $(window).height();
  console.log(height);
  $(".site-wrapper").css("height", height);
  $("#main_img").css("height",height - 110);
  
  $('a').click(function(){
      $('html, body').animate({
          scrollTop: $( $(this).attr('href') ).offset().top
      }, 300);
      return false;
  });