You have a few choices:

1. Use input type="submit" and scale the input using ems.
Advantages
Will scale in most browsers
works in all mobile browsers
works with CSS disabled
works with images disabled
works with javascript disabled

Disadvantages:
Does not scale in Safari or Camino
Can only use images as a background image which you can't scale easily

2. Use button type="submit", use a scaling image and scale the image and
button using ems.
Advantages
Will scale in all browsers that support the button element
works with CSS disabled
works with images disabled (if you use decent alt text)
works with javascript disabled

Disadvantages:
Button is not supported by some mobile browsers and Netscape 4

3: Use a link around scaling image
Will scale in all browsers
works with CSS disabled
works with images disabled (if you use decent alt text)

Disadvantages:
will not work with javascript disabled (needed for form submit

If you want to see the examples of the button element have a look at a
presentation I gave 2.5 years ago, it also show the limitations of the input
element.
http://nickcowie.com/presentation/s5-button.html



Nick Cowie
http://nickcowie.com


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