By default, so you don't need to copy it into your javascript. We should ideally use an external script, the plugin will create a temporary iframe element to capture the response when uploading files. You'd use this method if the form is well represented in HTML already. You'd just read in the page, populate the form inputs with stuff, then call .submit(). It'll use the method and action defined in the form's declaration, rather than inserting our script inline. The 'beforeSubmit' callback can be provided as a hook for running pre-submit logic or for validating the form data. If the 'beforeSubmit' callback returns false then the form will not be submitted. We can link to this in the head section of the page using a script tag, or link to it at the bottom of the page for speed.
