Custom Menu - How add a class to current page?

[sergio00]

Hi!

I have a simple custom menú at my Header linked to the most important parts of my forum.

( for example: Calendar.php , forumdisplay.php?f=7, etc etc ).

For this, I have a list

<ul class="header-buttons">
<li><a href="video.php" class="videos"></a></li>
<li><a href="calendar.php" class="calendar"></a></li>
<li><a href="forumdisplay.php?f=7" class="articles"></a></li>

</li>

How can add a new class to the current page when I visit it?. For example hightlight the text?

.currentclass {
font-weight: bold;
}

Exist a conditional class? a Script? a PHP code to add this new class?

BEst regards!