Do you still use gifs or other pixel graphics for buttons on web pages? I hope not. CSS3 support is available in all modern browsers, so rounded corners, gradients, shadows, etc are no problem.
See this jsfiddle for the CSS class definitions and a minimal HTML sample.
Without box shadow:
Oliver Doepner
Oliver Doepner
Oliver Doepner
With box shadow:
Oliver Doepner
Oliver Doepner
Oliver Doepner
Oleander Donovan's IT blog 