Image on Pagination

Im trying to put a image on my pagination blog, but i dont know how.
I want to put a image like a “Next page” button.

**code:**

<div class="pagination-content aligncenter" style="text-align:center;">
    <?php kriesi_pagination($blog->max_num_pages, $range = 2); ?>
    </div>

**function.php**

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

Thanks!