Adding jQuery plugin to Drupal
I don't think you can do it that way. You can always do it quick and dirty, depending on how it's written.

If it's your own code, wrap it in the following and throw it in a block:

(function ($) {
    // in this function, you can use the $ which refers to the jQuery object
}(jQuery));


Or you can try creating a generic file content type with a file attachment, upload the .js into the public directory, then make a new block with a PHP filter and use drupal_add_js() and load in that file.