Done! Works in every single browser.

  div {
  background: red;
  width: 250px;
  height: 250px;
  top: 50%;
  left: 50%;
  position: absolute;
  margin: -125px 0 0 -125px; /* Width of Element / 2 = Negative Left Margin
				Height of Element / 2 = Negative Top Margin */
 }

Live demo http://www.faramarzhashemi.com/valign.html