function switchTab(target){
  $('.tabscontainer div.tab_block').hide();
  $('#s' + target).fadeIn();
  $('ul#tab_list a').removeClass('active_section');
  $('ul#tab_list a[href="#section' + target +'"]').addClass('active_section');
}

$(document).ready(function() {
  var url_id = window.location.hash.slice(-2);
  if (url_id == ''){target='01';} else {target = url_id;}
  switchTab(target);

  $('ul#tab_list a').click(function(){
  var anchor_id = $(this).attr('href').slice(-2);
  switchTab(anchor_id);
  });
});