Ok, it's working now but it seems it could be a problem.
I've put all my files in a directory on my ftp server : "AGKplayer.js","AGKPlayer.asm.js","AGKPlayer.html.mem". In this directory there is the directory "media" with all my datas.
I've edited the html page to add the name of the directory for these 3 files...
But the "AGKplayer.data" must be in the root directory and no in the directory of my web app.
The problem was that this file was in the directory of my app but when it is in the root directory "www" of my ftp server, it's working... Ok, cool. But if I want to add a new app on my server, the AGKplayer.data will be the same for my two apps ?? :/ I don't know how to avoid this problem :/
Starbuzzzz