includes and javascript calls within pages

I recently installed the text control plugin, which I thought would enable me to turn off wordpress formatting and use php includes and calls to external javascript files within pages and posts. This doesn’t seem to be the case. Even with formatting and encoding turned off with the plugin, wordpress will still change < to &lt; I tried linking to an external js file with the same name as the js function call, just like it says in the wordpress documentation — to no avail.

Anyone have any experience with this? Thanks in advance.