[kh99]

Create a new plugin using hook bbcode_create and this code:

ini_set('highlight.keyword', '#ffffff');

of course you can change the #ffffff to whatever you want. Also, if you want to change anything other than the keyword, here's the list of things you can change: http://us2.php.net/manual/en/misc.co...x-highlighting

Edit: I should have added, this will only change it for new posts, until the cached posts expire. If you want it to take effect for all posts immediately, you could truncate the 'postparsed' database table.