Vista Style Glossy Button

background-image: linear-gradient(
  top,
  rgb(138, 138, 138)    0,
  rgb(102, 102, 102)  50%,
  rgb( 36,  36,  36)  50%,
  rgb(  0,   0,   0) 100%
);
background-image: -moz-linear-gradient(
  top,
  rgb(138, 138, 138)    0,
  rgb(102, 102, 102)  50%,
  rgb( 36,  36,  36)  50%,
  rgb(  0,   0,   0) 100%
);
background-image: -webkit-gradient(
  linear,
  left top,
  left bottom,
  color-stop(  0, rgb(138, 138, 138)),
  color-stop(0.5, rgb(102, 102, 102)),
  color-stop(0.5, rgb( 36,  36,  36)),
  color-stop(1.0, rgb(  0,   0,   0))
);

Requirements: Firefox 3.6 Beta 3+, Safari 4+ or Chrome 4+.