#main { background: url(../img/back_main.gif) repeat-y left;}

/* 主要コンテンツ部分 */
#side-menu{
	width:179px; height:240px;
	margin:0; padding:0;
	text-align:left;
}

#side-menu ul {margin:0; padding:0;}
#side-menu li {margin:0; padding:0 0 3px 0; float:left; list-style-type:none; background:#fff;}

ul#cont a, ul#cont-blog a {
	display:block;
	height:30px;
	overflow:hidden;
	text-decoration:none;
}

#cont li a, #cont-blog li a{
	height:30px;
	display:block;
	overflow: hidden;
	background:url(/img/side-menu.gif) no-repeat;
	text-indent:-9999em;
}

#cont #home { width:179px; }
#cont #ecopla { width:179px; }
#cont #environment {width:179px; }
#cont #idea { width:179px; }
#cont #works { width:179px; }
#cont #network { width:179px; }
#cont #recruit { width:179px; }
#cont #company { width:179px; }

#cont #home a { background-position: 0px 0px ;}
#cont #ecopla a { background-position: 0px -30px ;}
#cont #environment a { background-position: 0px -60px ;}
#cont #idea a { background-position: 0px -90px ;}
#cont #works a { background-position: 0px -120px ;}
#cont #network a { background-position: 0px -150px ;}
#cont #recruit a { background-position: 0px -180px ;}
#cont #company a { background-position: 0px -210px ;}

#cont #home a:hover { background-position: -179px 0px ;}
#cont #ecopla a:hover { background-position: -179px -30px ;}
#cont #environment a:hover { background-position: -179px -60px ;}
#cont #idea a:hover { background-position: -179px -90px ;}
#cont #works a:hover { background-position: -179px -120px ;}
#cont #network a:hover { background-position: -179px -150px ;}
#cont #recruit a:hover { background-position: -179px -180px ;}
#cont #company a:hover { background-position: -179px -210px ;}

/* 訪れたページのメニュー部分をアクティブ状態に */
#cont #home_visited { width:179px; }
#cont #ecopla_visited { width:179px; }
#cont #environment_visited { width:179px; }
#cont #idea_visited { width:179px; }
#cont #works_visited { width:179px; }
#cont #network_visited { width:179px; }
#cont #recruit_visited { width:179px; }
#cont #company_visited { width:179px; }

#cont #home_visited a { background-position: -179px 0px ;}
#cont #ecopla_visited a { background-position: -179px -30px ;}
#cont #environment_visited a { background-position: -179px -60px ;}
#cont #idea_visited a { background-position:-179px -90px ;}
#cont #works_visited a { background-position: -179px -120px ;}
#cont #network_visited a { background-position: -179px -150px ;}
#cont #recruit_visited a { background-position: -179px -180px ;}
#cont #company_visited a { background-position: -179px -210px ;}