Moin,
ich habe mal die von mir genannte Zeile in den Footer geschrieben.
Man könnte natürlich noch dazuschreiben: "im Chat sind..."
Du willst aber, dass auch die Leute angezeigt werden, die "den Tag über" im Chat waren?
Nachtrag:
Beim MChat sind das wohl die verantwortlichen:
 // whois chatting stuff
   'MCHAT_GUEST_USERS_TOTAL'         => '%d guests',
   'MCHAT_GUEST_USERS_ZERO_TOTAL'      => '0 guests',
   'MCHAT_GUEST_USER_TOTAL'         => '%d guest',   
   'MCHAT_HIDDEN_USERS_TOTAL'         => '%d hidden',
   'MCHAT_HIDDEN_USERS_TOTAL_AND'      => '%d hidden and ',
   'MCHAT_HIDDEN_USERS_ZERO_TOTAL'      => '0 hidden',
   'MCHAT_HIDDEN_USERS_ZERO_TOTAL_AND'   => '0 hidden and ',
   'MCHAT_HIDDEN_USER_TOTAL'         => '%d hidden',
   'MCHAT_HIDDEN_USER_TOTAL_AND'      => '%d hidden and ',
   'MCHAT_ONLINE_USERS_TOTAL'         => 'In total there are <strong>%d</strong> users chatting :: ',
   'MCHAT_ONLINE_USERS_ZERO_TOTAL'      => 'In total there are <strong>0</strong> users chatting :: ',
   'MCHAT_ONLINE_USER_TOTAL'         => 'In total there is <strong>%d</strong> user chatting :: ',   
   'MCHAT_REG_USERS_TOTAL'            => '%d registered, ',
   'MCHAT_REG_USERS_TOTAL_AND'         => '%d registered and ',
   'MCHAT_REG_USERS_ZERO_TOTAL'      => '0 registered, ',
   'MCHAT_REG_USERS_ZERO_TOTAL_AND'   => '0 registered and ',
   'MCHAT_REG_USER_TOTAL'            => '%d registered, ',
   'MCHAT_REG_USER_TOTAL_AND'         => '%d registered and ',   
   
   'WHO_IS_CHATTING'         => 'Who is chatting',
Damit kannst Du sicherlich etwas basteln...
Gruß
CPG