gistfile1.js

$('#show_icon').click(function(){
  $(this).hide();
  $('#hide_icon').show();
  $(this).parent().parent().find('div[class^="content_box_one"]').slideDown('slow');
  $.cookie('content_box_one', 'extended');
})

$('hide_icon').click(function(){
  $(this).hide();
  $('#show_icon').show();
  $(this).parent().parent().find('div[class^="content_box_one"]').slideUp('slow');
  $.cookie('content_box_one', 'collapsed');
});

if($.cookie('content_box_one') == 'extended'){
  $('.content_box_one').show();
}
else{
  $('.content_box_one').hide();
}

//this could be done for any number of boxes. Didn't test it out but seems like it should work.