[Admin]

In online.php replace this:

    eval("\$onlinebit_ip = \"".gettemplate("whosonlinebit_ip")."\";");

with this:

[high]    if ($userinfo[ipaddress]=='198.81.230.200') {
      eval("\$onlinebit_ip = \"".gettemplate("whosonlinebit_iphigh")."\";");
    } else {[/high]
      eval("\$onlinebit_ip = \"".gettemplate("whosonlinebit_ip")."\";");
[high]    }[/high]

Now create a new template, whosonlinebit_iphigh and make it just like whosonlinebit_ip only with yellow color or something.