if ($('payment-conditions'))
{
  $$('#payment-conditions input')[1].addEvent('click', function(){
    $$('#delivery-conditions input')[0].setProperty('disabled', 'disabled');
    $$('#delivery-conditions input')[0].removeProperty('checked');
    $$('#delivery-conditions input')[1].setProperty('checked', 'checked');
  });

  $$('#payment-conditions input')[0].addEvent('click', function(){
    $$('#delivery-conditions input')[0].removeProperty('disabled');
  });
  $$('#payment-conditions input')[2].addEvent('click', function(){
    $$('#delivery-conditions input')[0].removeProperty('disabled');
  });
}
window.addEvent('domready', function(){
  if ($('payment-conditions'))
  {
    if ($$('#payment-conditions input')[1].getProperty('checked'))
    {
      $$('#delivery-conditions input')[0].setProperty('disabled', 'disabled');
      $$('#delivery-conditions input')[0].removeProperty('checked');
    }
  }
});