#sub-index a {
	background-image:url(img/sub_index.gif);
}
#sub-summer a {
	background-image:url(img/sub_summer.gif);
}
#sub-junior-college a {
	background-image:url(img/sub_junior-college.gif);
}
#sub-high-school a {
	background-image:url(img/sub_high-school.gif);
}
#sub-junior-high-school a {
	background-image:url(img/sub_junior-high-school.gif);
}
#sub-lessonlist a {
	background-image:url(img/sub_lessonlist.gif);
}

#p-index #sub-index a, #p-summer #sub-summer a, #p-junior-college #sub-junior-college a, #p-high-school #sub-high-school a, #p-junior-high-school #sub-junior-high-school a, #p-lessonlist #sub-lessonlist a {
	background-position:-240px top;
}