#enter a{
display:block;
width:189px;
height:39px;
}
#enter a:hover{
background:url(img/index00.jpg) no-repeat -57px 0px;
}
#exit a{
display:block;
width:189px;
height:39px;
}
#exit a:hover{
background:url(img/index00.jpg) no-repeat -261px 0px;
}