Turning off create folder and upload options in browser

I have managed to remove the upload option in the Image Properties form by setting:

FCKConfig.ImageUpload = false ;

in the fckconfig.js but when the user clicks Server Browser the upload option (and create folder option) are enabled in there.

Basically I'm trying to create a 'read only' image repository. Is there a way of disabling upload and creation folder options in the server file browser?