[Plugin: pagebar] Adding a new class ?

Hello,

I tried to use that code this way, but it didn’t give me what I need.

<?php if (function_exists('postbar')) : ?>
<div class="mystyle">
<?php postbar(); ?>
</div>
<?php endif; ?>

I want to display “mystyle” class just in case postbar function exist.

Is it possible ?

Thanks

http://wordpress.org/extend/plugins/pagebar/