This tutorial will show you how to preload images.
Each time a visitor visites your site, all images are
downloaded into the cache of their computer. So,
instead of having to download the images a second time
you preload them so next time they visit the site, it will download much faster.
Now, their are diferent ways on doing this, so i have included a few bellow.
I used to use that method before, but then i found one that works better.
And then with this one you must add: onLoad="preload('myimage.jpg')" in the body tag.
if you have multiple images (most likely), you can have it like :
onLoad="preload('imageone.jpg', 'imagetwo.jpg', 'imagethree.jpg')"
Whichever method you choose is up to you, but the last method seems to work best!