Her kategoride farklı logo nasıl olabilir?

<?php if(is_home()){ ?>
 
 <!-- Buradan-->
   <?php if (get_option('op_logo_on') == 'on') { ?>
	
	    <a href="<?php bloginfo('url'); ?>">
		    <?php $logo = (get_option('op_logo') <> '') ? get_option('op_logo') : get_bloginfo('template_directory').'/images/logo.png'; ?>
		    <img src="<?php echo $logo; ?>" alt="Logo" id="logo"/>
	    </a>
	  
	 <?php } else { ?>
	
	 
	<div id="title_box">
		<a class="site_title" href="<?php bloginfo( 'url' ) ?>/" title="<?php bloginfo( 'name' ) ?>" rel="Home"><?php bloginfo( 'name' ) ?></a>
		
		<?php if (get_option('op_site_description') == 'on') { ?>
		<p class="tagline">"<?php bloginfo( 'description' ) ?>"</p>
        <?php } ?>
<!--Buraya kadar sitenin orjinal logo kodu idi--!>
    
<?php } else { 
 
   $category = get_the_category(); ?>  
   <img src="<?php bloginfo('template_url'); ?>/images/<?php echo $category[0]->category_nicename; ?>.jpg" />     
          
<?php } ?>

<link rel="stylesheet"
href="<?php bloginfo('stylesheet_url'); ?>"
type="text/css" media="screen" />

<?php if ( is_category('5') ) {
//kategoriye özel tema yükleme ?>
<link rel="stylesheet"
href="<?php bloginfo('template_url'); ?>/category-5.css"
type="text/css" media="screen" />;
<?php } else { ?>
<link rel="stylesheet" href="<?php bloginfo('stylesheet_url'); ?>"
type="text/css" media="screen" />
<?php } ?>