The Takeheart web site has no clear-cut tree structure, more of a pick and mix. A short menu , a "Back" button and a "Mail me" facility are on every page. Selecting the Takeheart logo will return you to the Home Page. Over 500 references to the literature backing up statements made in the text are accessed by selecting a number in brackets in relevent places. There is a comprehensive index, as well as a search facility on the home page.