Problem detected – pagination in function.php affects featured image on admin

i have experimented several scripts of pagination without plugin at functions.php and all of them disable the featured image function on wp-admin. What is happening? Please help.

sample script

`function kriesi_pagination($pages = ”, $range = 2)
{
$showitems = ($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 != $pages)
{
echo “<div class=’pagination’>”;
if($paged > 2 && $paged > $range+1 && $showitems < $pages) echo “«“;
if($paged > 1 && $showitems < $pages) echo “‹“;

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>”:”“.$i.”“;
}
}

if ($paged < $pages && $showitems < $pages) echo “›“;
if ($paged < $pages-1 && $paged+$range-1 < $pages && $showitems < $pages) echo “»“;
echo “</div>\n”;
}
}´