<?php
    if (function_exists('get_rand_img_from_post')):
        if ( $my_random_image = get_rand_img_from_post()):?>
            <a href="<?php echo $my_random_image['post-link']?>" title="<?php echo $my_random_image['title']?>"><?php echo $my_random_image['imgtag']?> </a>
        <?php else: ?>
            <a href="<?php the_permalink();?>" title="<?php the_title();?>"><img src="<?php bloginfo('template_directory'); ?>/images/default.jpg" /> </a>
        <?php endif;?>
    <?php endif;?>