Need bold unread messages

[Aaron10]

Ok, take a look at this image:



Where it says 'Unread:' I want the following number to be bolded but only if its a number other than 0. eg. 3,4,7 but have it normal when its 0. Like these:

Unread: 3

Unread: 0

Heres the html for that area in my index.template.php:

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// Only tell them about their messages if they can read their messages!
if ($context['allow_pm'])
//echo  '<span class="8pt" style="font-weight: normal;">', $txt[152], ' <a href="', $scripturl, '?action=pm">', $context['user']['messages'], ' ', $context['user']['messages'] != 1 ? $txt[153] : $txt[471], '</a>', $txt['newmessages4'], ' ', $context['user']['unread_messages'], ' ', $context['user']['unread_messages'] == 1 ? $txt['newmessages0'] : $txt['newmessages1'];
echo '<a href="', $scripturl, '?action=pm">Private Messages</a>: Unread ', $context['user']['unread_messages'], ', Total ', $context['user']['messages'], '.';
echo'</span>

Any help will be greatly appreciated!

[Aaron10]

bump

[[SiNaN]]

Find:

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', $context['user']['unread_messages'], '

Replace:

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', $context['user']['unread_messages'] != 0 ? '<b>' : '', $context['user']['unread_messages'], $context['user']['unread_messages'] != 0 ? '</b>' : '', '