How-To: Optimize Loading of Hover Images
Most web sites, when you hover over the link, the image loads, often creating a funny look - however temporary.
There is a way to have those images load with the page? but I can?t remember how?
That ?funny? look is the delay between the onHover event and the image being loaded
http://www.good-tutorials.com/tutorial/26488/-how-to-optimize-loading-of-hover-images