Probleme avec .htaccess

Bonjour,
voila je viens de mettre un blog sur mon site mais jais un petit probeleme je site ne marche pas jais une erreur 500 internal server error
donc je c'est que ça vien de mon .htccess alors mon site et http://web-maghreb/com et le blog est dans le répertoire /blog_maghreb donc ça fais http://web-maghreb.com/blog_maghreb mais ça marche pas
voici mon .htaccess :

php_flag register_globals 0
<IfModule mod_rewrite.c>

RewriteEngine on

#ErrorDocument 404 /

RewriteRule ^avatar(/)?$ avatar.php [NC]
RewriteRule ^edit(/)?$ edit.php [NC]
RewriteRule ^logout(/)?$ index.php?logout=1 [NC]
RewriteRule ^delete(/)?$ delete.php [NC]
RewriteRule ^post(/)?$ post.php [NC]
RewriteRule ^post/withfriends(/)?$ post.php?withfriends=1 [NC]


RewriteRule ^links(/)?$ links.php [NC]
RewriteRule ^links/withfriends(/)?$ links.php?withfriends=1 [NC]

RewriteRule ^register(/)?$ register.php [NC]

RewriteRule ^befriend/([a-z]+[a-z0-9_]*)(/)?$ befriend.php?friend=$1 [NC]

RewriteRule ^defriend/([a-z]+[a-z0-9_]*)(/)?$ defriend.php?friend=$1 [NC]

RewriteRule ^users/([a-z]+[a-z0-9_]*)(/)?$ user.php?user=$1 [NC]
RewriteRule ^users/([a-z]+[a-z0-9_]*)/withfriends(/)?$ user.php?user=$1&withfriends=1 [NC]
RewriteRule ^users/([a-z]+[a-z0-9_]*)/([0-9]+)(/)?$ user.php?user=$1&post=$2 [NC]
RewriteRule ^links/([a-z]+[a-z0-9_]*)/([0-9]+)(/)?$ links.php?user=$1&links=$2 [NC]
RewriteRule ^images/([a-z]+[a-z0-9_]*)/([0-9]+)(/)?$ images.php?user=$1&images=$2 [NC]
RewriteRule ^users/([a-z]+[a-z0-9_]*)/feed(/)?$ feed.php?user=$1 [NC]

RewriteRule ^all_blogs/([a-z]+[a-z0-9_]*)(/)?$ all_blogs.php?user=$1 [NC]
RewriteRule ^all_links/([a-z]+[a-z0-9_]*)(/)?$ all_links.php?user=$1 [NC]
RewriteRule ^all_images/([a-z]+[a-z0-9_]*)(/)?$ all_images.php?user=$1 [NC]
</IfModule>

que faire??
merci d'avance
Cordialement,
Rapido