Ever wanted to detect when the user is watching a specific element in your DOM-tree? Well, now you can - With jQuery Bullseye. This is a versatile & lightweight plug-in for jQuery that adds enterviewport and leaveviewport events to elements.
A. Sherstyuk, D. Vincent, and C. Jay. Proceedings of ICAT 2008: 18th International Conference on Artificial Reality and Telexistence, (December 2008)Yokohama, Japan.