Vimeo or YouTube thumb link

video_embed.php

<?php
        if (!ctype_digit($videolink)) :
        // has chars other than digits == YouTube
    ?>
        <div class="video column six<?php echo ($video_count === $last) ? ' last' : ''; ?>">
            <a class="videopopup" href="http://youtube.com/v/<?php echo $videolink; ?>">
                <img src="http://img.youtube.com/vi/<?php echo $videolink; ?>/0.jpg">
            </a>
        </div>
    <?php
        else:
        // Vimeo
        // http://vimeo.com/api/v2/video/video_id.output
        $vimeo_url = 'http://vimeo.com/api/v2/video/'.$videolink.'.json';
        $vimeo = json_decode(curl_get($vimeo_url));
    ?>
        <div class="video column six<?php echo ($video_count === $last) ? ' last' : ''; ?>">
            <a class="videopopup" href="http://player.vimeo.com/video/<?php echo $videolink; ?>">
                <img src="<?php echo $vimeo[0]->thumbnail_large; ?>">
            </a>
        </div>
    <?php endif; ?>