unable to get the wysiwyg form on a nginx server - error 404

In WYSIWYG, because the form is call with the path index.php?q=syntaxhighlighter_insert_wysiwyg/insert/form-idxxx, i can't get him because my site is powered by nginx with the perusio's configuration, wich prevent direct attempt to access PHP files.

Clean url are enabled.

Here a quick fix about this issue
In the file syntaxhighlighter_insert_wysiwyg.js change the line
var aurl = Drupal.settings.basePath + 'index.php?q=syntaxhighlighter_insert_wysiwyg/insert/' + form_id;

with this
var aurl = Drupal.settings.basePath + 'syntaxhighlighter_insert_wysiwyg/insert/' + form_id;

Maybe is there a more cleaner solution ? As detect if clean url are enabled and then choose the good path to call the form ?