jQuery(document).ready(function($){

  // rebuild the paypal URL with the selected values
  var set_the_url = function(){
    var select1 = $("#page-buy-six #choose-book1 select").val();
    var select2 = $("#page-buy-six #choose-book2 select").val();
    var select3 = $("#page-buy-six #choose-book3 select").val();
    var select4 = $("#page-buy-six #choose-book4 select").val();
    var select5 = $("#page-buy-six #choose-book5 select").val();
    var select6 = $("#page-buy-six #choose-book6 select").val();
    var the_url = 'https://www.paypal.com/cart/add=1&business=VNUSKHR265ME6&item_name=Mixed+6:+' + select1 + ',+' + select2 + ',+' + select3 + ',+' + select4 + ',+' + select5 + '+and+' + select6 + '&quantity=1&amount=20.00&weight=.4';
    //var the_url = 'https://www.paypal.com/cart/add=1&business=VNUSKHR265ME6&item_name=Mixed+6:+' + select1 + ',+' + select2 + ',+' + select3 + ',+' + select4 + ',+' + select5 + '+and+' + select6 + '&quantity=1&amount=20.00&weight=.4';
    return the_url;
  }

  // set the thumbnail, lightbox and submit values
  $("#page-buy-six .choice select").change(function() {
    var choice = $(this).val();
    $(this).parent().find('.thumb img').attr('src','images/thumb-' + choice + '.jpg')
    $(this).parent().find('.thumb').attr('href','/images/' + choice + '/photo01.jpg')

    $("#page-buy-six #the_submit").attr( 'href', set_the_url() );

  });

  // set the initial options on page load
  $("#page-buy-six #the_submit").attr( 'href', set_the_url() );

});