Changing where Altiris 7.5 stores images

I am very new to Altiris so I am having some problems.

  I have set up the Altiris on a system with a C: (80GB) and a D: (2TB) drive.  Unfortunately the .gho images are being stored on the C: partition and are using up all the space and I want them to be stored on the D: drive under the /IMAGES subdirectory.  How can I change the path for image stores?