I recently purchased the canon ip4200 printer for the purpose of printing directly onto cds and dvds.

the canon cd labelling software is very intuitive to use, however i would like to create/edit the images i print in photoshop and would like to be able to visualise the finished results before i am ready to print. to that end i have created a template in photoshop that is the diameter of the printable area on a cd and would like to create circular guides on the template to mark the interior and exterior printing boundaries. does anyone know how to do this.
thanks in advance
Simon