Add custom javascript files to drupal node pages

I recently writing some Processing tutorials. but when i want add javascript files i found there is no module that let me easily add external javascript files for each node page. so, i try make simple drupal module that add custom text field , this field can be added to each node type and users can add required javascript fies they need. it has some security issues and should be used just for granted user.

https://drupal.org/project/2092971/git-instructions