*{margin:0;padding:0;border:0;}
#top {
line-height: 47px; list-style-type: none;
}
#top a {
display: block; width: 71px; text-align:center;
}
#top a:link {
color:#CC3399; text-decoration:none;
}
#top a:visited {
color:#CC3399;text-decoration:none;
}
#top a:hover {
color:#FF6666;text-decoration:none;
}
#top li {
list-style:none;
float: left;
}
#top li a:hover{
list-style:none;
width: 71px;height: 47px;
background-image:    url(http://www.mengsa.cn/images/top_nav_background.gif);
background-repeat: no-repeat;
}