print $node_url does not work on frontpage titles

Hi,

Can you please help me with this:

I'm using your Grunge Drupal theme for a site currently under development.

If I put stories (blog posts) to the front page, print $node_url will have no effect, i.e. the title is not linked to the content though it is in node.tpl.php as usual:

<h2><a href="<?php print $node_url ?>" title="<?php print $title ?>"><?php print $title ?></a></h2>

Please let me know how I could solve this.

Best,
Csaba