It's not too simple. If you want to make it in order to use that AND learn something you should:
1. Download firebug.
2. Open it, and go to convertfiles.com url.
3. Click firebug's last tab, and check there whats going on when you input any file and do submit. You'll see that it post's some data to "http://www.convertfiles.com/converter.php", you have to write code that will post that data to that url. Main thing is to check how the site is generating "progress_key" in order to get it and it is used to check if converting is completed. Java script is also required to check that.
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