*{ padding:0; margin:0;}
ul { list-style:none; }
.banner{ width:100%; height:461px; background:url(../images/line.gif) bottom repeat-x; margin:0 auto; clear:both;}
.www51buycom { width: 100%; height: 450px; margin:0 auto; position:  absolute; overflow:hidden;  }
.www51buycom img{ width:100%; height:450px;}
.www51buycom .num { overflow:hidden; height: 25px; position: absolute; bottom:30px; left:45%; zoom:1; z-index:3 }
.www51buycom .num li { width: 25px; height: 25px; line-height: 25px; text-align: center; font-weight: 400; font-family:Arial, Helvetica, sans-serif; color: #FFFFFF; background: #444444; margin-right: 10px; border-radius:50%; cursor:pointer; float: left; }
.www51buycom .num li.on { background: #FF7700;} 
.www51buycom .prev,
.www51buycom .next { display: none; width: 40px; height: 100px; background: url(btn.png) no-repeat; position: absolute; top: 175px;}
.www51buycom .prev { left: 0;}
.www51buycom .next { right: 0; background-position: right;}