ul.nav{ 
margin:0; padding:0;
list-style:none;
width:800px;
height:40px;
}
ul.nav li{
float:left;
}
ul.nav li a{
display:block;
text-decoration:none;
text-indent:-9999em;
}


li.n1 a{
background:url(../img/base/navi.jpg) no-repeat 0 0;
width:161px;
height:40px;
}
li.n1 a:hover{
background:url(../img/base/navi.jpg) no-repeat 0 -40px;
}

li.n2 a{
background:url(../img/base/navi.jpg) no-repeat -161px 0;
width:159px;
height:40px;
}
li.n2 a:hover{
background:url(../img/base/navi.jpg) no-repeat -161px -40px;
}

li.n3 a{
background:url(../img/base/navi.jpg) no-repeat -320px 0;
width:162px;
height:40px;
}
li.n3 a:hover{
background:url(../img/base/navi.jpg) no-repeat -320px -40px;
}

li.n4 a{
background:url(../img/base/navi.jpg) no-repeat -482px 0;
width:159px;
height:40px;
}
li.n4 a:hover{
background:url(../img/base/navi.jpg) no-repeat -482px -40px;
}

li.n5 a{
background:url(../img/base/navi.jpg) no-repeat -641px 0;
width:159px;
height:40px;
}
li.n5 a:hover{
background:url(../img/base/navi.jpg) no-repeat -641px -40px;
}