.mainslider
{
width:100%;
top: 0px;
position: absolute;
height:855px;
}
#left{
float:left;
margin-top:250px;
background:url("/images/mainslider/left.png") no-repeat left top;
height:60px;
width:80px;
cursor:pointer;
}

#right{
float:right;
margin-top:250px;
background:url("/images/mainslider/right.png") no-repeat right top;
height:60px;
width:80px;
cursor:pointer;
}

#right:active,#left:active
{
margin-top:252px;
}