A original form of periodic system (a spiral form) is used to query the database with periodic system of elements. The application is only a demo one, it contains links only to few elements (H, He, Li, Be, B, C).
The image (system.gif) is from cover of [Lorentz JÄNTSCHI, Mihaela Ligia UNGURESAN, Special Chapters of Chemistry for Automatics (in Romanian), UTPres, ISBN 973-8335-15-9, Cluj-Napoca, Romania, 202 p., 2001].
In fact, this aplication only wants to demonstrate the advantage of Area Map usage in HTML documents.
Periodic System of Elements - Spiral version