Where on PHPBB do I Insert a JS Tracking Script

To Track New Signups?

[martinibuster]

I'm running a PPC campaign to drive new signups on a phpbb forum. I want to insert a tracking script so that I can track the effectiveness of the campaign.

But after poking around the phpbb files, I couldn't find a logical place to drop in the code.

Which file is appropriate for dropping in a PPC JS code for tracking a conversions?

[maccas]

Maybe this will work.

$message = $lang['Account_added'];

to

$message = $lang['Account_added'] . '<script src...';

in includes/usercp_register.php