html, body {
	margin: 0px;
	height: auto;
	background-color: #fff;
	font-family: verdana;
	font-size: 10px;
}

#past
{
  display: block;
  width: 440px;
  height: 337px;
  background: url("past.jpg") no-repeat 0 0;

}

#past:hover
{ 
  background-position: 0 -337px;
}

#present
{
  display: block;
  width: 464px;
  height: 397px;
  background: url("present.jpg") no-repeat 0 0;

}

#present:hover
{ 
  background-position: 0 -397px;
}