I've been trying to figure out this problem all day. In firefox, when a input button is disabled, it is somewhat slightly bigger than the original. However, it returns to normal size when button becomes active again. But, problem does not appear in ie6. Can someone figure out what is going on?
Simple, there is nothing in the specifications to say what form elements should look like, so every browser maker went their own damned direction resulting in a confusing mess. Do not expect consistant apperance of submits, buttons, etc cross browser, as there is no such thing.