How can I restrict access by usergroup?

[JohnM]

PHP Code:

<?php

include("./global.php");
if (!$bbuserinfo[userid] || $bbuserinfo[usergroupid]==1 || $bbuserinfo[usergroupid]==3) {
    show_nopermission();
}
eval("dooutput(\"".gettemplate("chat")."\");");

?>

chat template:

<APPLET align=middle code="com.diginet.digichat.client.DigiChatApplet" 
codeBase="http://www.yoursite.com/DigiChat/DigiClasses/"
 width="200" height="100" align="middle" ARCHIVE="client.jar" nickname="$bbuserinfo[username]">
          <PARAM NAME="siteID" VALUE="site id">
          <PARAM NAME="cabbase" VALUE="Client.cab">
          <PARAM NAME="background" VALUE="{ pagebgcolor}">
          <PARAM NAME="textcolor" VALUE="{ pagetextcolor}">
          <param name="floodControl" value="1000">
          <PARAM NAME="nickname" VALUE="$bbuserinfo[username]">
          <PARAM NAME="openProfileURL" VALUE="true">
          <PARAM NAME="room" VALUE="chat-room-name">     
          Our Chat requires a Java Compatible web browser to run.
          </APPLET>

Remove the spaces for the replacement variables in red above, and insert the correct values that are in blue.