i18n and relative links into node content

i have some problems with all my relative links that are in my html node content:especially for displaying images:
i'm using a lot of images to display in my nodes content wthi relative links like this:

<a title="blabla" href="assets/files/download/kit/freeze/kit-freeze.htm"><img src="assets/xmedia/images_download/freeze.png" alt="voir un aperçu en version kit graphique" /></a>

when i18n is enable, all "internal" relative links are transformed in :
http://mysite.com/en/assets/files/download/kit/kit-bleusheet.htm
http://mysite.com/fr/assets/files/download/kit/kit-bleusheet.htm
idem for images:
http://mysite.com/en/assets/files/myimage.jpg
.....
then, all my images are not displayed on my site and relative links to html pages (or other files) give me an 404 error.
???question: i have to create two root folders with my fpt client to put in my images files ??
/fr => files for french site
/en => files for english site

An other mistake !! on /node page (default frontpage) ,, relative links are not transformed with i18n, why ? i have to create an other default folder for files => /assets

please help me (sorry for my bad enghish..;)