Custom Pagination

Hi, I’m trying to make the pagination on
this page, look like the pagination on
this page.

I have this coding on the bottom of my main index:

<div id='pagination'>
<div id='olderposts'>
<?php
// include pagination
if( function_exists( 'wp_pagenavi ' ) ) {
     wp_pagenavi();
} else {
     next_posts_link('← Older Posts');
     } ?>
</div>
<div id='newerposts'>

<?php
if( function_exists( 'wp_pagenavi ' ) ) {
     wp_pagenavi();
} else {

	previous_posts_link('Newer Posts →');
	} ?>
</div>
</div>

That makes it look like that.
But the categories page uses the pagination.php file. I’ve edited it every way I can think of and can’t get it to look the same.

This is my pagination code:

<?php
/**
 * @package WordPress
 * @subpackage CleanMag Theme
 */

//pagination function
function pagination($pages = '', $range = 4)
{
     $showitems = ($range * 2)+1; 

     global $paged;
     if(empty($paged)) $paged = 1;

     if($pages == '')
     {
         global $wp_query;
         $pages = $wp_query->max_num_pages;
         if(!$pages)
         {
             $pages = 1;
         }
     }  

     if(1 != $pages)
     {
         echo "<div class=\"pagination clearfix\">";
         if($paged > 2 && $paged > $range+1 && $showitems < $pages) echo "<a href='".get_pagenum_link(1)."'>? First</a>";
         if($paged > 1 && $showitems < $pages) echo "<a href='".get_pagenum_link($paged - 1)."'>? Previous</a>";

         for ($i=1; $i <= $pages; $i++)
         {
             if (1 != $pages &&( !($i >= $paged+$range+1 || $i <= $paged-$range-1) || $pages <= $showitems ))
             {
                 echo ($paged == $i)? "<span class=\"current\">".$i."</span>":"<a href='".get_pagenum_link($i)."' class=\"inactive\">".$i."</a>";
             }
         }

         if ($paged < $pages && $showitems < $pages) echo "<a href=\"".get_pagenum_link($paged + 1)."\">Next ?</a>";
         if ($paged < $pages-1 &&  $paged+$range-1 < $pages && $showitems < $pages) echo "<a href='".get_pagenum_link($pages)."'>Last ?</a>";
         echo "</div>\n";
     }
}
?>

How can I get the pagination for all pages to look the same, showing only older posts and newer posts?
Thanks.