Actually originally this code is in head.tpl
Code:
{******** Remove this line to display how much products there are online ****
<tr>
{insert name="productsonline" assign="_productsonline"}
<td colspan="2" class="NumberOfArticles" align="right">
{if $config.Appearance.show_in_stock eq "Y"}
{insert name="itemsonline" assign="_itemsonline"}
{$lng.lbl_products_and_items_online|substitute:"X":$_productsonline:"Y":$_itemsonline}
{else}
{$lng.lbl_products_online|substitute:"X":$_productsonline}
{/if}
</td>
</tr>
**** Remove this line to display how much products there are online ********}
This code is from 4.1.10.