How many items can I insert in a portfolio?

Hi,

We are addingportfolio’s to the following site: http://www.doulasophie.nl/birth-photography/portfolio-bevallen/, That works fine — except for the fact hat we seem to be able to add only 6 images to each portfolio post. Is that correct? If yes, is there way we can change that in the code?

Thanks for your input!

Rogier
Rotterdam, The Netherlands