How to correct css flicker effect

Time and time again I see high quality designed sites with very poor coding such as flickering css  effect, amateurs!. Here is an example of what's going wrong. Looking at the example, you can see that when you move the mouse over the link, the background disappears and waits for the new image to load, there is a few ways to fix this, you can use JavaScript to pre-load the images or you can use a css technique which I will show you.Firstly [...]