base_url

[eluser]cahva[/eluser]
Can you give whole html output of the generated link?

BTW, you should use url-helper as that helps a lot

The same with helper:

Code:

<?php echo anchor('login/logout','Logout') ?>

// Will create for example -->
<a href="http://www.mywebsite.com/index.php/login/logout">Logout</a>

If you have .htaccess and you have removed the index.php from config, that will ofcourse be removed from url.