#roll_top, #fall, #ct
{
	position: relative;
	cursor: pointer;
	height: 72px;
	width: 26px;
}
#roll_top
{
	background: url(../img/top.gif) no-repeat;
}
#fall
{
	background: url(../img/top.gif) no-repeat 0 -80px;
}
#ct
{
	background: url(../img/top.gif) no-repeat 0 -40px;
}
#roll
{
    z-index:2;
	display: block;
	width: 15px;
	margin-right: -500px;
	position: fixed;
	right: 51%;
	top: 70%;
	_margin-right: -525px;
	_position: absolute;
	_margin-top: 300px;
	_top: expression(eval(document.documentElement.scrollTop));
}