PS - make sure your js validation doesn't have any extra whitespace. Here is an example again...
Code:
if (document.getElementById('po444').selectedIndex == 0)
{ alert('Please select...'); return false;
}
if (document.getElementById('po445').selectedIndex == 0)
{ alert('Please select...'); return false;
}
if (document.getElementById('po447').selectedIndex == 0)
{ alert('Please select...'); return false;
}
else return true;