Hi,
This should be possible. Please find the code for the Calendar button in Index.template.php, and paste it here.
It will look a bit like:
// The [calendar]!
if ($context['allow_calendar'])
echo ($current_action == 'calendar' || $context['browser']['is_ie4']) ? '<td class="maintab_active_' . $first . '"> </td>' : '' , '
<td valign="top" class="maintab_' , $current_action == 'calendar' ? 'active_back' : 'back' , '">
<a href="', $scripturl, '?action=calendar">' , $txt['calendar24'] , '</a>
</td>' , $current_action == 'calendar' ? '<td class="maintab_active_' . $last . '"> </td>' : '';
I do not actually need the graphic made
Well, all the buttons are using the same graphic, it just has text overlaid.