"Custom image header" function

Hello, I used WordPress a few months ago to make a multilingual On-line Résumé. I’ve just updated a theme (wp-coda) to my needs and everything is working fine.

I’m using qTranslate function (in the code of my header) to display different headers per language. For example !
<?php echo (__('<!--:fr--><div id="fr_header"><!--:--><!--:en--><div id="en_header"><!--:--><!--:tw--><div id="tw_header"><!--:-->')); ?>. Then just a few css code and everything is fine.

Each header is one image. This image has on it’s left a logo and/or the name of the person and on the right his picture.

I’m also a web-master of a forum and I wanted to help members to have their own Résumé too. That’s when I discovered the WP Multisite functionality. I would like to find a way to avoid to recreate all different headers (multilingual) for each user. So the solution is to use “Custom image header” function. When WP Multisite is activated, only “Custom image header” function allows “blog” users to upload a different header.

Here is what I would like to do:
1) [Multisite admnistration] To have a master template with a default header (no name, no logo and no picture)
2) [Blog/Website admnistration] To be able to use the “”Custom image header” function” to upload two different images: the one of the logo and the one the picture. Theses images won’t replace the header, but will be put as a layer above the header.

My problem is to know if the “Custom image header” function” can deal with multi images upload. And if “yes”, how I can do that. Is there any tutorial ?

Thanks ! 🙂