How do I upload my skin to my profile locally without using the Browse button?

Description from original post (created 2012-11-06 17:59):

I've tried using this:

http://minecraft.net/profile/skin/remote?url=file:///C:/Users/Daddy/Downloads/Skin.png

But it didn't work. I'm trying to make a skin uploader script for a friend because he can't get the Browse button to work on the minecraft.net/profile page.