function openCategory(img_cat_name) {
	document.getElementById(img_cat_name).src='images/folderopen.gif';
}
function closeCategory(img_cat_name) {
	document.getElementById(img_cat_name).src='images/folder.gif';
}

function toggleCompanyPerson(el) {
  var company = parseInt(el.value);

  el_company = document.getElementsByClassName('company');
  for (i=0;i<el_company.length ;i++ ) {
    el_company[i].style.display = (company) ? '' : 'none';
  }

  el_person = document.getElementsByClassName('person');
  for (i=0;i<el_person.length ;i++ ) {
    el_person[i].style.display = (company) ? 'none' : '';
  }
}

function toggleTransportType(el) {
  var transport_type = el.value;

  els = document.getElementsByClassName('courier');
  for (i=0;i<els.length ;i++ ) {
    els[i].style.display = (transport_type == 'courier') ? '' : 'none';
  }

  els = document.getElementsByClassName('store');
  for (i=0;i<els.length ;i++ ) {
    els[i].style.display = (transport_type == 'store') ? '' : 'none';
  }

  els = document.getElementsByClassName('our_transport');
  for (i=0;i<els.length ;i++ ) {
    els[i].style.display = (transport_type == 'our_transport') ? '' : 'none';
  }
}