function navigation (what) {
  value = what.options[what.selectedIndex].value;
  if (value == "") return;
  window.location.href = value;
}

function check_empty(form) {
	if (form.caption.value == '' && form.content.value == '') {alert('Empty Message!');return false}
	return true;
}

function check_empty_caption(form) {
	if (form.caption.value == '') {alert("Empty Topic Caption!");return false;}
	return true;
}