This thesis describes a prototype software tool that intervenes in the process of searching the web for health information. The tool automatically analyzes a collection of web pages that have been returned by a general search engine and returns an ordered list of web pages. To the user ranked by likelihood of containing useful high-quality information, defining quality is a difficult issue and universal agreement on a set of criteria is unlikely. This project used criteria that, although not validated, have been adapted from those proposed by respected authors in the medical field.