Avatar in template

[Gellpak]

I'm attempting to place the current user's avatar in a location in the header template, but the avatar variables I know fail to display the image. I tried adding the below code to the end of global.php but it didn't help. Any suggestions?

$bbuserinfo['user_avatar']="<img src='{$bbuserinfo['user_avatar']}' alt='Edit Your Avatar' border='0'>";
$bbuserinfo['user_avatar']="<a href='profile.php?{$session['sessionurl']}&do=editavatar'>{$bbuserinfo['user_avatar']}</a>";
$welcome_avatar=$bbuserinfo['user_avatar'];