Trying to implement a script

I am trying to implement a shoutbox it requires the full path to the users profile which I know is at my_profile.php here are some examples....

/enable CMS profiles : links shoutbox messages to user profiles (for content management systems)
//example: http://yoursite.com/profile.php?user=bob (IMPORTANT: DO NOT enter username in url below)

Then in the examples

V3 Profiles/Dating: http://www.yoursite.com/v3shoutbox/?usr=<?php echo $pro_name;?>
Joomla: http://www.yoursite.com/v3shoutbox/?usr=<?php echo $name = $my->username;?>
Mambo: http://www.yoursite.com/v3shoutbox/?usr=<?php echo $name = $my->username;?>
phpFOX: http://www.yoursite.com/v3shoutbox/?usr=<?php echo $VAR[4];?>
Profile Manager: http://www.yoursite.com/v3shoutbox/?usr=%%login%%
osDate: http://www.yoursite.com/v3shoutbox/?usr={$smarty.session.UserName}
SMF: http://www.yoursite.com/v3shoutbox/?usr=<?php echo $context['user']['name'];?>

Sorry for this very long post but if someone wants to download and install to help me it's free at http://www.v3chat.com/shoutbox.php

Or if anyones what the heck I should put there

Thanks
Admin??

:D