Blender question

Does anyone know how to change the resolution when saving UV maps as images in Blender? I found an image panel in the documentation that includes resolution, but didn't see how to get that panel to display.
modelling of 3-Dimensional characters
http://www.makehumancommunity.org/forum/
http://www.makehumancommunity.org/forum/viewtopic.php?f=7&t=14298