I do a lot of styled submit buttons. An awful lot. In fact, I tend to earmark an entire day on any sizeable project for sorting out the button styles. I’m not talking about a bit of padding and border colour, but full-blown background image with rollover (and sometimes hover) styles, for maybe one hundred different submit and anchor elements across a site.

Using background images for anchor elements is bulletproof across all browsers, the same used to be true for submit inputs, before IE8 came along.