still not working :(

<li><a href="{$base_url}/index.php">HOME</a></li>
<li><a href="{$base_url}/upload.php/">UPLOAD</a></li>
<li><a href="{$base_url}/recent.php/">WATCH</a></li>
<li><a href="{$base_url}/tags.php/">TAGS</a></li>
<li><a href="{$base_url}/channels.php/">CHANNELS</a></li>
<li><a href="{$base_url}/group_home.php/">GROUPS</a></li>
<li><a href="{$base_url}/friends.php/">FRIENDS</a></li>