Correction:
Also, this condition:
[quote]
if (!isset($_POST['txtLoginName']) || empty($_POST['txtLoginName']))
[/quote]
is true if and only if no form element by the name txtLoginName
existed on the previous page - and on top of that, empty() does the
same as isset() and apart from that also checks whether, if the
variable has been set, it has a value (0, "", NULL or FALSE) that
evaluates to FALSE.
This condition is of course also true when the form element has existed
but has no value.
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