/* index画面のボタン設定 */

a:hover img
{
	visibility:hidden;
}

#a_b_home a
{
	display:block;
	width:100px;
	height:30px;
	background-repeat:no-repeat;
}

a#a_b_home:hover
{
	display:block;
 	background-image:url("img/on_b_home.png");
	background-repeat:no-repeat;

}

#a_b_obj a
{
	display:block;
	width:100px;
	height:30px;
	background-repeat:no-repeat;
}

#a_b_obj a:hover
{
	display:block;
 	background-image:url(img/on_b_obj.png);
	background-repeat:no-repeat;

}

#a_b_intro a
{
	display:block;
	width:100px;
	height:30px;
	background-repeat:no-repeat;
}

#a_b_intro a:hover
{
	display:block;
 	background-image:url(img/on_b_intro.png);
	background-repeat:no-repeat;

}

#a_b_staff a
{
	display:block;
	width:100px;
	height:30px;
	background-repeat:no-repeat;
}

#a_b_staff a:hover
{
	display:block;
 	background-image:url(img/on_b_staff.png);
	background-repeat:no-repeat;

}


#a_b_labo a
{
	display:block;
	width:100px;
	height:30px;
	background-repeat:no-repeat;
}

#a_b_labo a:hover
{
	display:block;
 	background-image:url(img/on_b_labo.png);
	background-repeat:no-repeat;

}

#a_b_facilities a
{
	display:block;
	width:100px;
	height:30px;
	background-repeat:no-repeat;
}

#a_b_facilities a:hover
{
	display:block;
 	background-image:url(img/on_b_labo.png);
	background-repeat:no-repeat;

}

#a_b_gallery a
{
	display:block;
	width:100px;
	height:30px;
	background-repeat:no-repeat;
}

#a_b_gallery a:hover
{
	display:block;
 	background-image:url(img/on_b_junbi.png);
	background-repeat:no-repeat;

}