@charset "UTF-8";
.nav .how_to a{background:url(../../../common/image/menu_global.png) no-repeat -120px -481px;}

div#btn_how_to a{
margin:10px auto;
background:url(../image/btn_how_to.png) no-repeat;
display:block;
text-indent:-9000px;
width:186px;
height:44px;
}
div#btn_how_to  a:hover{background:url(../image/btn_how_to.png) no-repeat -186px 0;}