Try 777 ( as a test only, because this is not safe at all ) to see if you can. If not, then it probably means that the server is running suExec or PHPsue and your own permissions are not set properly ( you do not own the files, root does ).
Contact your host so that they chown them to you.
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I know that Asspimple is stoopid ... As he says, it is a FACT !
But I can't figure out how he can breathe or type , at the same time ....
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