#main_menu {
	margin: 0;
	padding: 0;
	height: 25px;
	width: 750px;
	float: left;
}
#main_menu li {
	text-indent: -9999px;
	float: left;
	list-style: none;
}
#main_menu a {
	text-decoration: none;
	display: block;
	height: 25px;
	width: 150px;
}
/*メニューボタン（通常時）*/
#navi1 a { background: url(../img/menu.jpg) no-repeat 0 0; }
#navi2 a { background: url(../img/menu.jpg) no-repeat -150px 0; }
#navi3 a { background: url(../img/menu.jpg) no-repeat -300px 0; }
#navi4 a { background: url(../img/menu.jpg) no-repeat -450px 0; }
#navi5 a { background: url(../img/menu.jpg) no-repeat -600px 0; }
/*メニューボタン（オンマウス時）*/
#navi1 a:hover { background: url(../img/menu.jpg) no-repeat 0 -25px; }
#navi2 a:hover { background: url(../img/menu.jpg) no-repeat -150px -25px; }
#navi3 a:hover { background: url(../img/menu.jpg) no-repeat -300px -25px; }
#navi4 a:hover { background: url(../img/menu.jpg) no-repeat -450px -25px; }
#navi5 a:hover { background: url(../img/menu.jpg) no-repeat -600px -25px; }