通过ajax将表单（POST）中的变量发送到另一个PHP脚本（GET）

For last couple days I've tried to find proper upload script for my files. When I found one I've noticed that I could use couple more features for it. In this script there is a simple form with just "Browse" button, progress bar (Ajax, jQuery/JS) and the Upload button. That's it. What I'm trying to do is to add some features to the form, like choosing category of the file. So here's the code for For last couple days I've tried to find proper