#navupper_leftZone li.case_1 img{display:block;}
#navupper_leftZone li.case_2 img{display:block}
#navupper_leftZone li.case_3 img{display:block}
#navupper_leftZone li.case_4 img{display:block}
#navupper_leftZone li.case_5 img{display:block}
#navupper_leftZone li.case_6 img{display:block}
#navupper_leftZone li.case_7 img{display:block}
#navupper_leftZone li.case_8 img{display:block}