Avec WordPress c plus simple, mais avec Joomla c autre chose, mais voila qlq way a suivre :
1) Confirm that your web hosting company support's Apache and mod_rewrite.
2) Access your web host using an FTP client
3) Navigate to the root directory or Joomla installation directory.
4) Select the htaccess.txt file and rename it to .htaccess
5) Now Access the Joomla administrator console
6) Select the Global Configuration item.
7) Select the SEO tab
8) Enable Search Engine Friendly URLs
9) A popup box will now appear to confirm you have renamed the htaccess.txt to .htaccess
10) When you view your web the URL's will now look like http://www.site.com/content/view/1/2/ or http://www.domain.com/Section_Name/C...ame/Item_Name/

hop it help you.