Rule 1: Don't use joomla
Seriously though, you can use preg_replace ( PHP: preg_replace - Manual ) to insert nofollows into your code. You may need a professional to write the line if you can't find a good example online that'll work for your purposes.
Then you can do something like this:
PHP Code:
<?php
if(!preg_match("expression",$domain)) {
preg_replace(); //fill this line in with the code to add nofollow
}
?>
And make $domain equal to the domain you don't want to nofollow to (ie, your own). You can add "or" modifiers if you'd like multiple domains on the whitelist. Alternatively, you can just create a blacklist and remove the ! from the if statement.
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