Undefined Variable: Button_Remove in compare.tpl

Hi,
Got this notice in the remove button in the compare list.
Notice: Undefined variable: button_remove in /home/heldera/public_html/prodecor.pt/catalog/view/theme/megastore/template/product/compare.tpl on line 123

My code is:
<tr>
<td></td>
<?php foreach ($products as $product) { ?>
<td class="remove"><a href="<?php echo $product['remove']; ?>" class="button"><?php echo $button_remove; ?></a></td>
<?php } ?>
</tr>