any php pro out there? avatar problem!

Heya,
just a simple question: is there anybody of you who can change the following code from showing the author’s avatar into the showing the logged-in user’s avatar? please give a little help for a lonely german boy! ??


global $wpdb, $cmdava, $cmdava_allowed_fileextension, $cmdava_avatars_path, $cmdava_userpics_path;

$the_comment_ID = get_comment_ID();
if($the_comment_ID && $author_id == 0) {
$the_author = $wpdb->get_var("SELECT user_ID FROM $wpdb->comments WHERE comment_ID='$the_comment_ID'");
}
elseif(get_the_author_id() && $author_id == 0) $the_author = get_the_author_id();
else $the_author = $author_id;
$image_path = get_bloginfo('wpurl')."/".$cmdava['avatars_path']."/";
$the_avatar = $image_path.$the_author;
$user_pic_found = false;
if($mode == "userpic") {
$userpic_path = get_bloginfo('wpurl')."/".$cmdava['userpics_path']."/";
$the_userpic = $userpic_path.$the_author;
foreach ($cmdava_allowed_fileextension as $extension) {
if(file_exists("$cmdava_userpics_path/$the_author.$extension"))
$user_pic_found = '<img src="' . $the_userpic. '.' .$extension. '" alt="' . $the_author_name . '" class="' . $cmdava['userpic_class'] . '" />';
}
}
if($user_pic_found) {
echo $user_pic_found;
}
else {
foreach ($cmdava_allowed_fileextension as $extension) {
if(file_exists("$cmdava_avatars_path/$the_author.$extension"))
echo '<img src="' . $the_avatar. '.' .$extension. '" alt="' . $the_author_name . '" class="' . $cmdava['avatar_class'] . '" />';
}
}