Help with FileReference file uploading. Size issue

Greetings,
I’m trying to build a page using the FileReference tutorial on this website.
Everything is working great, but some how I can’t seem to figure out how to adjust the file size attributes that control how big files are that can be uploaded.
I’m not that great with Flash (yet) so any help that could be provided would great.
So far, i’m just using the component as is. I have no problem uploading test files up to about 10 meg, but anything bigger then that just seems to disappear.
Any thoughts?
Jack