How to create Button MouseOver effect

[Gaijin]

A better way to do it using CSS is to have an image twice the height of your button, the top half has your normal state, bottom half the hover state then use the background-position to change them. This will remove the loading lag when you hover for the first time.

Yes that is also a good choise to do, uhmm how could I forgot that.
And as you say, CSS is much better for such things since it removes the loading time.

Thank you.