FCK EDITOR Error:Permission denied function.mkdir

solution
Open the file fckeditor\editor\filemanager\connectors\php\config.php

Give correct value for this parameters

// Path to user files relative to the document root.
$Config['UserFilesPath'] = '/imagesedit/' ;

// Fill the following value it you prefer to specify the absolute path for the
// user files directory. Useful if you are using a virtual directory, symbolic
// link or alias. Examples: 'C:\\MySite\\userfiles\\' or '/root/mysite/userfiles/'.
// Attention: The above 'UserFilesPath' must point to the same directory.
$Config['UserFilesAbsolutePath'] = '/home/mysite/public_html/imagesedit' ;

Check the Folder permissions