#v_banner_slider{width: 1000px; height: 300px; margin: 0 auto ; padding: 0px; border:none;}
.btn_span { background: no-repeat center top; width: 100%; height: 100%; float:left;  }

/*visual pre/next btn*/

.btn_prev a { background:url(/_img/main/visual_left.png) 0px 0px no-repeat; padding: 0px; height: 40px; width: 40px;  position: absolute; top: 250px; left:50%; margin-left:-500px; text-indent: -99999em; z-index: 99; outline: none; opacity: 0.6; }
.btn_prev a:hover { background:url(/_img/main/visual_left.png) -40px 0px no-repeat; text-decoration: none; cursor: pointer; opacity: 1.0;}

.btn_next a { background:url(/_img/main/visual_right.png) -40px 0px no-repeat; padding: 0px; height: 40px; width: 40px; position: absolute; top: 250px;  margin-right:50%; right:-500px;text-indent: -99999em; z-index: 99; outline: none; opacity: 0.6;}
.btn_next a:hover { background:url(/_img/main/visual_right.png) 0px 0px no-repeat; text-decoration: none; cursor: pointer; outline: none; opacity: 1.0;}