How can I access my mom's MobileMe calendar in addition to my own in iCal?

I already have my MobileMe account set up with my iCal but my mom is constantly updating hers and I want to figure out how to put both calendars in my iCal (Mac OS 10.5.7). Help?|||Go to MobileMe Support and select the appropriate country/language, choose "Syncing with MobileMe," select "Troubleshooting MobileMe Sync issues," and then select "Chat Now."