Большие аватары в темах форума

.thread_view .messageList a.avatar img,
.thread_view .quickReply a.avatar img,
.conversation_view .messageList a.avatar img,
.conversation_view .quickReply a.avatar img
{
    width: 142px;
    height: auto;
}

<xen:avatar user="$user" size="m" />

<xen:avatar user="$user" size="l" img="true" />