#head { background-image: url(../h_img/top_head_back.gif); background-repeat: repeat-x; width: 100%; height: 14px; clear: both }
#head span { position: absolute; width: 0; height: 0; overflow: hidden }
#groupbtn { margin-right: auto; margin-left: auto; width: 980px; clear: both }
#groupbtn ul  { list-style-type: none; padding-top: 10px; float: right }
#groupbtn ul li { background-image: url(../h_img/to_group_btn.gif); display: block; width: 171px; height: 25px }
#groupbtn ul li a { background-image: url(../h_img/to_group_btn.gif); display: block; width: 171px; height: 25px }
#groupbtn ul li span { position: absolute; width: 0; height: 0; overflow: hidden }