There is a native WordPress function to do exactly what it sounds like you’re trying to do.
You need to replace
userphoto_thumbnail($user_info, $before="", $after="", $attributes = array(width => '40', height => '40'), $default_src="")
with
get_avatar($user_info->ID,40)
Check here for your future reference – http://codex.wordpress.org/Function_Reference/get_avatar
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