problemas con Upload

[giotari]

estoy tratando de subir un archivo al servidor pero me envia los siguientes errores:

Warning: fopen("upload//camara.jpg", "wb") - Permission denied in /var/www/html/virtual/santiagowanderers.cl/www/pruebas/upload.php on line 10

Warning: fwrite(): supplied argument is not a valid File-Handle resource in /var/www/html/virtual/santiagowanderers.cl/www/pruebas/upload.php on line 11

Warning: fclose(): supplied argument is not a valid File-Handle resource in /var/www/html/virtual/santiagowanderers.cl/www/pruebas/upload.php on line 12
Server HaD Receive the Upload Files!


mi script es el siguiente:
<?
for($i=0;$i<sizeof($userfile);$i++)
{
if(!$userfile_size[$i])
continue;

$UPLOAD = fopen( $userfile[$i], "r" );
$contents = fread( $UPLOAD,$userfile_size[$i]);
fclose( $UPLOAD );
$SAVEFILE = fopen("upload//".$userfile_name[$i], "wb" );
fwrite( $SAVEFILE, $contents,$userfile_size[$i] );
fclose( $SAVEFILE );
}
echo "Server HaD Receive the Upload Files!";

?>