How to compare a "post title" to "navigation title" and highlight

Hello everybody,
I am trying to highlight a navigation element if it has the same title as the current page being shown.

For example:

If I Visit the Page “home” only the navigation button which has the title “home” should be given another css rule = opacity:1; how can I achieve this?

For now, it queries the current category posts and links them to the single posts, but I don’t know what to compare and not completely mess it up.

<?php
foreach(get_the_category() as $category)
{
$cat = $category->category_nicename;
}

$page_title = get_the_title();
?>

<?php query_posts('category_name=' . $cat . ''); ?>
<?php while (have_posts()) : the_post(); ?>
<?php if ($page_title == '###COMPARE HERE###') : ?>
<div style="opacity:1;"><a href="<?php the_permalink() ?>"><strong><?php the_title(); ?></strong></a></div>

<?php else : ?>

<div><a href="<?php the_permalink() ?>"><strong><?php the_title(); ?></strong></a></div>
<?php endif; ?>
<?php endwhile;?>