Gravatar Weirdness…same code — different results

Hi,

I’m working on a design for my weight loss blog in my sandbox.

I’m using the Blix theme which had gravatar code that didn’t appear to be working so I pulled over the code I know is working on my personal blog.

However, it appears to be doing the default image and not picking up the comment author email which is definitely there.

<?php if (function_exists('gravatar')) {
if ('' != get_comment_author_url()) {
echo "<a href='$comment->comment_author_url' title='Visit $comment->comment_author'>";
} else {
echo "<a href='http://www.gravatar.com' title='Create your own gravatar at gravatar.com!'>";
}
echo "<img height='80' width='80' src='";
if ('' == $comment->comment_type) {
echo gravatar($comment->comment_author_email);
} elseif ( ('trackback' == $comment->comment_type) || ('pingback' == $comment->comment_type) ) {
echo gravatar($comment->comment_author_url);
}
echo "' alt='a gravatar' class='gravatar' /></a>";
} ?>

Can someone see what’s wrong and point it out to me?