Replacing a submit button with an image using CSS

I just created a new image to replace the generic submit button appearance, when I remembered the submit buttons are type submit, not type image. I decided to use some quick CSS instead. The trick is adding a background image to the submit button, and then *hiding* the button text by adding padding-top CSS that is greater than the height of the image, and adding "overflow: hidden" to ensure the text does not get pushed outside the button...