checkbox

I hava a table, with 15 sectors, i want that user can select all the sectos he wats, y use repeat region to make de checbox appear, but went i press the boton to send the email with universal email, only i get one checkbox selected...check the page: http://bioambiental.org/cursos-inscripcion-3.php

<?php
// RepeatSelectionCounter_1 Begin Loop
$RepeatSelectionCounter_1_IterationsRemaining = $RepeatSelectionCounter_1_Iterations;
while($RepeatSelectionCounter_1_IterationsRemaining--){
if($RepeatSelectionCounterBasedLooping_1 || $row_rsSector){
?>
<input type="checkbox" name="w" value="<?php echo $row_rsSector['sector']; ?>" />
<?php echo $row_rsSector['sector']; ?>
<?php
} // RepeatSelectionCounter_1 Begin Alternate Content
else{
?>
<?php } // RepeatSelectionCounter_1 End Alternate Content
if(!$RepeatSelectionCounterBasedLooping_1 && $RepeatSelectionCounter_1_IterationsRemaining != 0){
if(!$row_rsSector && $RepeatSelectionCounter_1_Iterations == -1){$RepeatSelectionCounter_1_IterationsRemaining = 0;}
$row_rsSector = mysql_fetch_assoc($rsSector);
}
$RepeatSelectionCounter_1++;
} // RepeatSelectionCounter_1 End Loop
?>