#fadeinbox
{
  position:absolute;
  width: 300px;
  left: 0;
  top: -400px;
  border: 2px solid black;
  background-color: white;
  padding: 4px;
  z-index: 100;
  visibility:hidden;
}

.centerdiv
{ /*IE method of centering a relative div*/
  text-align: center;
}

.centerdiv>div
{ /*Proper way to center a relative div*/
  margin: 0 auto;
}