find this on the header.php <div id=”featured”> and go to
<img src=”<?php echo bloginfo(‘template_url’); ?>/scripts/timthumb.php?src=/<?php $values = get_post_custom_values(“Image”); echo $values[0]; ?>&w=65&h=65&zc=1&q=100″ alt=”<?php the_title(); ?>” class=”left” width=”65px” height=”65px” /><?php } ?>
here you can change the width and height