#MAIN_NAV
{
	height: 28px;
	width: 990px;
	text-decoration: none;
	float: left;
	margin: 0px;
	padding: 0px;
	}
#MAIN_NAV ul {
	margin: 0px;
	padding: 0px;
}
#MAIN_NAV li {
	display: inline;  
	float: left;
	padding: 0px;
	margin: 0px;
	list-style-type: none;
}
#MAIN_NAV li a{
	display: block;
	font-size: 1px;
	text-indent: -9999px;
	height: 28px;
}

#MAIN_NAV ul li a.nav1 {
    background: url(../tw_images/menu/menu_01.jpg) left top no-repeat; 	width: 134px;
}
#MAIN_NAV ul li a.nav2 {
	background: url(../tw_images/menu/menu_02.jpg) left top no-repeat; 	width: 132px;
}
#MAIN_NAV ul li a.nav3 {
	background: url(../tw_images/menu/menu_03.jpg) left top no-repeat; 	width: 149px;
}
#MAIN_NAV ul li a.nav4 {
	background: url(../tw_images/menu/menu_04.jpg) left top no-repeat; 	width: 143px;
}
#MAIN_NAV ul li a.nav5 {
	background: url(../tw_images/menu/menu_05.jpg) left top no-repeat; 	width: 140px;
}
#MAIN_NAV ul li a.nav6 {
	background: url(../tw_images/menu/menu_06.jpg) left top no-repeat; 	width: 149px;
}
#MAIN_NAV ul li a.nav7 {
	background: url(../tw_images/menu/menu_07.jpg) left top no-repeat; 	width: 143px;
}

#MAIN_NAV ul li a:hover.nav1 {
	background: url(../tw_images/menu/menu_01.jpg) left bottom no-repeat;
}
#MAIN_NAV ul li a:hover.nav2 {
	background: url(../tw_images/menu/menu_02.jpg) left bottom no-repeat;
}
#MAIN_NAV ul li a:hover.nav3 {
	background: url(../tw_images/menu/menu_03.jpg) left bottom no-repeat;
}
#MAIN_NAV ul li a:hover.nav4 {
	background: url(../tw_images/menu/menu_04.jpg) left bottom no-repeat;
}
#MAIN_NAV ul li a:hover.nav5 {
	background: url(../tw_images/menu/menu_05.jpg) left bottom no-repeat;
}
#MAIN_NAV ul li a:hover.nav6 {
	background: url(../tw_images/menu/menu_06.jpg) left bottom no-repeat;
}
#MAIN_NAV ul li a:hover.nav7 {
	background: url(../tw_images/menu/menu_07.jpg) left bottom no-repeat;
}