http://drbenkim.com/colon-clean-healthy.htmlthis one is good too.
Also here's Susun Weed's tip for having regular morning BMs;
"My mother's favorite way of preventing digestive distress and ensuring regularity is to eat at regular times and go to the toilet at regular times. You'd be surprised how effective this is.
o First thing in the morning, get yourself a cup of hot water (or herbal tea) and bring it back to bed. Sip it slowly, and gnaw gently on your bottom lip. Then lie on your back and bring your knees up, feet flat on the bed; place your palms on your belly and breathe deeply. Gently begin to rub your belly (in spirals): up on the right, across the middle, and down on the left. Soon you will feel the movement gathering momentum. Sit up slowly and head for the toilet."