This paper presents a system that makes it a simple task to create Web pages that provide explanations based on images or diagrams. The result approaches the dynamic presentations teachers are used to doing with the help of a blackboard or overhead project system. This naturally leads to the question of what constitutes a good explanation. The paper shows that some intelligent adaptive properties have to be included into the system in order to tailor the explanations to the needs of individual learners. The Easy-Web-Explainer is used to create pedagogic resources to be inserted in a curriculum. The system proposes a generic structure that can be used in the context of many teaching disciplines (from concrete, such as how to operate some kinds of equipment to perform a task, to abstract, such as understanding a proof in mathematics) that can be helped by embedding pictures and diagrams in a discourse. (AEF)