#main_otorihiki{position : relative;
	margin : 0 auto;
	width : 900px;
	height : 900px;
	background : url('./css_img/otorihiki.jpg') no-repeat;
}


#middle_nav{
	margin : 0 auto;
	width : 900px;
	height : 170px;
	position:relative;
	background : #e9ebe6 url('./css_img/middle_bt.gif') no-repeat;
	text-indent:-9999px;
}

#k_bt01{ position:absolute; width:318px; height:42px; left:113px; top:10px;}
#k_bt01 a{ margin:0; height:42px; display:block;}
#k_bt01 a:hover{background : url('./css_img/middle_bt_ov.gif') no-repeat -113px -10px; display:block;}

#k_bt02{ position:absolute; width:318px; height:42px; left:446px; top:10px;}
#k_bt02 a{ margin:0; height:42px; display:block;}
#k_bt02 a:hover{background : url('./css_img/middle_bt_ov.gif') no-repeat -446px -10px; display:block;}

#k_bt03{ position:absolute; width:318px; height:42px; left:113px; top:63px;}
#k_bt03 a{ margin:0; height:42px; display:block;}
#k_bt03 a:hover{background : url('./css_img/middle_bt_ov.gif') no-repeat -113px -63px; display:block;}

#k_bt04{ position:absolute; width:318px; height:42px; left:446px; top:63px;}
#k_bt04 a{ margin:0; height:42px; display:block;}
#k_bt04 a:hover{background : url('./css_img/middle_bt_ov.gif') no-repeat -446px -63px; display:block;}

#k_bt05{ position:absolute; width:318px; height:42px; left:113px; top:116px;}
#k_bt05 a{ margin:0; height:42px; display:block;}
#k_bt05 a:hover{background : url('./css_img/middle_bt_ov.gif') no-repeat -113px -116px; display:block;}

#k_bt06{ position:absolute; width:318px; height:42px; left:446px; top:116px;}
#k_bt06 a{ margin:0; height:42px; display:block;}
#k_bt06 a:hover{background : url('./css_img/middle_bt_ov.gif') no-repeat -446px -116px; display:block;}