jQuery(document).ready(function($){
  var $amount = $('#edit-field-journalist-payment-total-und-0-amount');
  $amount.attr('readonly', true);
  var $paymentNodes = $('#journalist-payment-node-form').find('#edit-field-journalist-payment-nodes');
  $amount.val(0);
  var $inputs = $paymentNodes.find('input');
  $inputs.each(function(index) {
    if ($(this).is(":checked")) {
      $amount.val($amount.val()*1 + $(this).closest('div').find('.journalist-node-price').attr('data-int')/100);
    } 
  });
  $paymentNodes.delegate('input', 'change', function(e) {
    if ($(this).attr("checked")) {
      $amount.val($amount.val()*1 + $(this).closest('div').find('.journalist-node-price').attr('data-int')/100);
    } 
    else 
    {
      $amount.val($amount.val()*1 - $(this).closest('div').find('.journalist-node-price').attr('data-int')/100);
    }
  });
  
});