?>
    <div class="new_header">
        <?php if (is_category('9')) { ?><img src="http://rockstartemplate.com/headerdesign/header%20background.jpg" alt="Smiley face"><?php
        } else if (is_category('15')) { ?><img src="http://rockstartemplate.com/headerdesign/header%20background.jpg" alt="Smiley face"><?php
        } else if (is_category('27')) { ?><img src="http://rockstartemplate.com/headerdesign/header%20background.jpg" alt="Smiley face"><?php
        } else if (is_category('5')) { ?><img src="http://rockstartemplate.com/headerdesign/header%20background.jpg" alt="Smiley face"><?php
        } else { ?><img src="http://rockstartemplate.com/headerdesign/header%20background.jpg" alt="Smiley face"><?php }
    ?>
    </div>
<?php