A, err, friend of mine had a small chalfont recently. I he found the following useful:
1. drink lots of water (make sure you don't get dehydrated so your stools are nice and loose)
2. when you feel the urge to go for a dump, go straight away (obviously, wait until you actually get into the toilet, you won't make many friends dropping a log in a meeting), rather than waiting until you're touching cloth
3. don't sit and strain for ages, do your business, finish the paperwork then exit the bathroom - no reading War and Peace
4. walking helped coax the bugger back in
Obviously, my friend's case wasn't severe, but it gave me him into a whole new world of experience