I finally focused the situation and tried a lot of trial on your website.
I decided to join zxing decoder in my mobile web application which has been developped. Therefore I am interested in using zxing opensource code in my webmobile project (not native but webmobile).
Now to be sure I kindly ask you: - Throught which link I can find the opensource code to use in my web application ?
Code is here: http://code.google.com/p/zxing/downloads/list
Some documentation: http://code.google.com/p/zxing/wiki/ScanningFromWebPages