JQuery :: Adding A File Upload To A Simple Form Submit?

I'm a CSS and PHP developer, finding myself using jquery and AJAX more and more, of course, and learning a little about it as i go. but only a little. :o)i have a client who's asked me to add an image upload feature to a simple comments post script i've "built". i can see, kind of, how this jquery is posting the form text inputs, but have no idea if this thing can even be made to post a file at the same time.Hoping someone might add a function for me to do this if it can be done?

$(document).ready(function(){
/* The following code is executed once the DOM is loaded */
/* This flag will prevent multiple comment submits: */

[code].....