[RoseCitySister]

To clarify – on or about line 75, find:

$scripturl = bb_get_option ('uri') . 'my-plugins/js_quicktags.js';

$thisurl = bb_get_option ('uri') . 'my-plugins/' . basename(__FILE__);

Change to:

$scripturl = bb_get_option ('uri') . '/my-plugins/js_quicktags.js';

$thisurl = bb_get_option ('uri') . '/my-plugins/' . basename(__FILE__);

In short, change the two instances of my-plugins/ to /my-plugins/

Great plugin, thanks!