HTML, BODY {height:100%;background-color:#504195;margin:0;padding:0;}

#tw {width:100%;height:100%;border:0px;border-collapse:collapse;}
#tw TR {padding:0;}
#tw TR TD {padding:0;width:100%;vertical-align:middle;text-align:center;}

#Table_01 {width:767px;border:0px;border-collapse:collapse;margin:0 auto;}
#Table_01 TR {padding:0;}
#Table_01 TR TD {padding:0;}


#bt {display:block;width:179px;height:155px; background: url(img/bt_btover.jpg) no-repeat;background-position:0 0;}
#bt:hover {background-position:0 -155px;}

#wj {display:block;width:179px;height:155px; background: url(img/wj_wjover.jpg) no-repeat;background-position:0 0;}
#wj:hover {background-position:0 -155px;}

#gr {display:block;width:179px;height:155px; background: url(img/gr_grover.jpg) no-repeat;background-position:0 0;}
#gr:hover {background-position:0 -155px;}