Seperating a list of users with a comma and space

[Simplemachines Cowboy]

Here is a block of code that displays a list of user names in a chat room.

Code Select Expand

<?php

$users = usersinroom($room['id']);
                                        if ($users) { 
                                          echo "<ul class=\"userList\" id=\"room_".$room['id']."\">";
                                          foreach( $users as $user ) {
    echo $user['login'] ;
  }

Right now, all the names are running together (User1User2etc).
I can't quite get the code to add a comma and a space between each user name (User1, User2, etc).

Help please!

Thanks in advance,

Cowboy

[Simplemachines Cowboy]

Anyone?