Odd Behaviour: DIE function

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I've noticed some strange behaviour with respect to validation of user input. 
Normally, using Linux, the die function in user input validation works as 
expected. However, the same code in IE, the DIE function does not work as 
expected.

I've noticed that fields, that should die and barf an error message, seem to 
allow no input. Often, I notice that the user has entered a different 
spelling as well. I'm puzzled by this (Furthermore, I wasn't aware the user 
could change the contents of a dropdown select list [I cannot duplicate it in 
Linux). Since one of the affected fields receives its input from an included 
file (provcountry.dpn), perhaps this ius an IE issue??

provcountry.dpn

<td><b>Country &nbsp;</b></td>
<td><SELECT NAME=rcountry>
 <option selected>Choose from List
 <OPTION>USA
 /* list of countries follows */


snippet code in validation page:

<?php
...

if ($_POST['rcountry'] == "Choose from List") die ("<h5><br><br>Please choose
your  Country from the drop-down list<br><br><br>Click 'Back' on your
 browser to enter this information</h5>");

...
?>

Any pointers of what I'm missing here would be appreciated.

Tia,
Andre

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