Upload impossible

Bonjour,

je viens de transférer mon site chez l'hébergeur, et il m'est impossible d'uploader des fichiers (même petit)

Pourtant tout marche en local, sur un serveur en LAN, mais en ligne nada : Les permissions me semblent pourtant bonne (j'ai mis tout les répertoires en 777 pour être sur),

Voila mon code

//Création Lien Absolu
$LienAbsolu = $AbsolutePathImgs.$_FILES['fichier']['name'];
//upload du fichier
$destination ='../Imgs';
$tmp_name=$_FILES['fichier']['tmp_name'];
$nom_fichier=$_FILES['fichier']['name'];
move_uploaded_file($tmp_name, "$destination/$nom_fichier");
//fin upload

les variables sont définis dans un include que voila

$ImgsPath= "	/var/www/vhosts/monsite/httpdocs/Imgs/";
// chemin vers dossier téléchargement
$DLDPath = "/var/www/monsite/httpdocs/Telechargements/";
// chemin vers dossier thumbnails (sous dossier images)
$ThbsPath = "	/var/www/vhosts/monsite/httpdocs/Imgs/thbs/";

et voila ce que me donne le log

[Mon Sep 21 10:08:15 2009] [error] [client 80.90.62.249] PHP Warning: move_uploaded_file(../Imgs/test.jpg) [<a href='function.move-uploaded-file'>function.move-uploaded-file</a>]: failed to open stream: Permission denied in /var/www/vhosts/monsite/httpdocs/CMS/MediaIndex.php on line 46, referer: http://monsite/CMS/MediaIndex.php?
[Mon Sep 21 10:08:15 2009] [error] [client 80.90.62.249] PHP Warning: move_uploaded_file() [<a href='function.move-uploaded-file'>function.move-uploaded-file</a>]: Unable to move '/tmp/phprM98cZ' to '../Imgs/test.jpg' in /var/www/vhosts/monsite/httpdocs/CMS/MediaIndex.php on line 46, referer: http://monsite/CMS/MediaIndex.php?
[Mon Sep 21 10:08:15 2009] [error] [client 80.90.62.249] PHP Notice: Undefined index: fichier in /var/www/vhosts/monsite/httpdocs/CMS/MediaIndex.php on line 41, referer: http://monsite/CMS/MediaIndex.php?
[Mon Sep 21 10:08:15 2009] [error] [client 80.90.62.249] PHP Notice: Undefined index: fichier in /var/www/vhosts/monsite/httpdocs/CMS/MediaIndex.php on line 44, referer: http://monsite/CMS/MediaIndex.php?
[Mon Sep 21 10:08:15 2009] [error] [client 80.90.62.249] PHP Notice: Undefined index: fichier in /var/www/vhosts/monsite/httpdocs/CMS/MediaIndex.php on line 45, referer: http://monsite/CMS/MediaIndex.php?
[Mon Sep 21 10:08:18 2009] [error] [client 80.90.62.249] File does not exist: /var/www/vhosts/monsite/httpdocs/Imgs/test.jpg, referer: http://monsite/CMS/ViewMedia.php?id_media=7 

merci d'avance si quelqu'un peut m'aider