#nav {
	margin: 0;
	padding: 0;
	display:block;
	background-image: url(../images/header_bg.png);
}	
#nav ul {
	margin:0; 
	padding:0;
	list-style-type:none;
}
#nav li {
	float:left;
	display:block; 
	width:70px;
	margin: 8px 5px 8px 8px;
	padding: 0;
}
#nav li.list1 {background:transparent url(../images/btn_about_off.png);}
#nav li.list2 {background:transparent url(../images/btn_facility_off.png);}
#nav li.list3 {background:transparent url(../images/btn_music_off.png);}
#nav li.list4 {background:transparent url(../images/btn_voice_off.png);}
#nav li.list5 {background:transparent url(../images/btn_news_off.png);}
#nav li.list6 {background:transparent url(../images/btn_portfolio_off.png);}
#nav a {display:block; width:70px; padding-top:70px; height:0; color:#000; text-decoration:none; overflow:hidden;}
* html #nav a:link, * html #nav a:visited {height:70px; he\ight:0;}

#nav a#item1 {background:transparent url(../images/btn_about_on.png) -70px -70px no-repeat;}
#nav a#item2 {background:transparent url(../images/btn_facility_on.png) -70px -70px no-repeat;}
#nav a#item3 {background:transparent url(../images/btn_music_on.png) -70px -70px no-repeat;}
#nav a#item4 {background:transparent url(../images/btn_voice_on.png) -70px -70px no-repeat;}
#nav a#item5 {background:transparent url(../images/btn_news_on.png) -70px -70px no-repeat;} 
#nav a#item6 {background:transparent url(../images/btn_portfolio_on.png) -70px -70px no-repeat;} 

#nav a#item1:hover {background-position:top right; z-index:50;}
#nav a#item2:hover {background-position:top right; z-index:50;}
#nav a#item3:hover {background-position:top right; z-index:50;}
#nav a#item4:hover {background-position:top right; z-index:50;}
#nav a#item5:hover {background-position:top right; z-index:50;} 
#nav a#item6:hover {background-position:top right; z-index:50;} 

* html #nav a:hover {height:70px; he\ight:0;}