upload errors

when tring to upload a jpg for a post the system spewes
The uploaded file could not be moved to /var/www/vhosts/myblog.org/httpdocs/myblog/wp-content/uploads.
when tring to upload a jpg for register-plus
Warning: move_uploaded_file(/var/www/vhosts/myblog.org/httpdocs/myblog/1_brickwall.jpg) [function.move-uploaded-file]: failed to open stream: Permission denied in /var/www/vhosts/myblog.org/httpdocs/zaharas/wp-content/plugins/register-plus/register-plus.php on line 274
all the premission look ok , this is a simi new install , and installing plugins works fine
Imm at a loss and fight bad wifi in a truck stop
ghk