Imported From: http://groups.google.com/group/in-portal-design/browse_thread/thread/fbd5a07a4ad4c5ca#

Here is one nice mouse interaction plugin, that guesses if user really was really trying to move mouse over an object or just passing through: http://cherne.net/brian/resources/jquery.hoverIntent.html

More intelligent, then built-in "hover" event.