I recently came across an article on particletree.com about rediscovering the button element. This article takes you through an example of how the button element was used to deliver buttons that look exactly the same across all major browsers, including Safari 2. If you're still using the input element for buttons then I'd recommend reading this article. To say the least, the button element has better semantics and is just as well, if not better, supported by all major browsers!