body{ padding:0px; margin:0px;}
.main_focus{position:relative;width:100%;height:490px;overflow:hidden;margin:0 auto;  }

 
.img_focus ul{width:100%;height:100%}

.img_focus ul li{float:left;width:100%; list-style:none;}

.img_mornitor{position:absolute;bottom:25px;right:50%;overflow:hidden;  }

.prev{position:absolute;bottom:40%;  left:26px;overflow:hidden; cursor:pointer; width:49px; height:135px; background-image:url(btn.png)}
.prev:hover{ background-color:#000;
  filter:alpha(opacity=50); /*IE滤镜，透明度50%*/
  -moz-opacity:0.5; /*Firefox私有，透明度50%*/
  opacity:0.5;/*其他，透明度50%*/}
.next{position:absolute;bottom:40%; right:26px;overflow:hidden;cursor:pointer;width:49px; height:135px;background-image:url(btn.png); background-position:0px -135px;}
.next:hover{ background-color:#000;
  filter:alpha(opacity=50); /*IE滤镜，透明度50%*/
  -moz-opacity:0.5; /*Firefox私有，透明度50%*/
  opacity:0.5;/*其他，透明度50%*/}
.img_mornitor ol li{float:left;/*background:url(../Images/list_icons.png) no-repeat -294px -312px;*/ background:#333;width:9px;height:9px;border-radius:5px;text-indent:-9999px;  margin-right:5px; cursor:pointer;}

.img_mornitor ol li.on{/*background-position:-294px -289px*/background:#fff;width:9px;height:9px;border-radius:5px; } 
.clr{ clear:both;}