Wordpress error "Unable to create directory" help needed!

[pri2sh]

when ever i try to upload theme,images or any other media from wordpress i get this error

Unable to create directory /home/vol4/host_3821167/htdocs/wp-content/uploads/2009/11. Is its parent directory writable by the server?

any help will be appreciated.

thanx

[ricktendo]

Very nice skin...sorry for just commenting and not knowing how to fix your problem

[NIM]

Check the CHMOD for those directories with FTP client.

[pri2sh]

thanx for comment rick & nik ,

I checked the chmod but but didnot know which permission to put . I think it is messed up after using WP-security plugin.