magento file uploading error http error

i analyses that media folder should me right-able i mean permission should be 7777

and other think is .htaccess permission


############################################
## adjust memory limit

#    php_value memory_limit 64M
    php_value memory_limit 256M
    php_value max_execution_time 18000


###############R A V I ###################
#php_value upload_max_filesize 712M
php_value post_max_size 712M

php_value upload_max_filesize 712M
php_value max_execution_time 2000
php_value max_input_time 2000
php_value memory_limit 512M
###############P U N I T ###################