.navi_back_left {
	BACKGROUND-POSITION: left 50%; BACKGROUND-IMAGE: url(/img/backgound/topnaviback4.jpg); BACKGROUND-REPEAT: no-repeat
}
.navi_back_right {
	BACKGROUND-POSITION: right 50%; BACKGROUND-IMAGE: url(/img/backgound/topnaviback4.jpg); BACKGROUND-REPEAT: no-repeat
}