Thanks Jason - that didn't seem to work.
I tried changing:
<input name="EmailList_<?php echo $RepeatSelectionCounter_1; ?>" type="hidden" id="EmailList_<?php echo $RepeatSelectionCounter_1; ?>" value="Y" <?php if (!(strcmp($row_rsEmail['EmailList'],"Y"))) {echo "checked=\"checked\"";} ?> />
to
<input name="EmailList_<?php echo $RepeatSelectionCounter_1; ?>" type="hidden" id="EmailList_<?php echo $RepeatSelectionCounter_1; ?>" value="N" />
and also
<input name="EmailList_<?php echo $RepeatSelectionCounter_1; ?>" type="hidden" id="EmailList_<?php echo $RepeatSelectionCounter_1; ?>" value="N" <?php if (!(strcmp($row_rsEmail['EmailList'],"N"))) {echo "checked=\"checked\"";} ?> />
But no luck with either.