Surplus Featured Image

<?php if(has_post_thumbnail() ) {

        $full_featured_img = wp_get_attachment_image_src( $post->ID, 'full-size');

        $portfolio_single_featured_img = wp_get_attachment_image_src( $post->ID, 'portfolio-single'); ?>

                <li class="slide">

                        <a href="<?php echo $full_featured_img[0]; ?>" title="<?php the_title; ?>" rel="prettyPhoto[gallery]"><img src="<?php echo $portfolio_single_featured_img[0]; ?>" alt="<?php the_title; ?>" /></a>

                </li>

<?php } ?>