.clearfix:before, .clearfix:after { content: '.'; display: block; overflow: hidden; visibility: hidden; font-size: 0; line-height: 0; width: 0; height: 0; }
.clearfix:after { clear: both; }
.clearfix { zoom: 1; }

.icon-arrow-a-left { background: url(prev.png) no-repeat; }
.icon-arrow-a-right { background: url(next.png) no-repeat; }
.icon-arrow-a-left, .icon-arrow-a-right { background-position: 0 0; height: 70px; width: 50px; }  /*左右两侧控制方向的图标宽高*/
#main { overflow: hidden; zoom: 1; position: relative; }
#index_b_hero { width:1100px;height: 350px; margin: auto; position: relative; }
#index_b_hero img { width:1100px; height: 350px; }  /*若前台页图片加链接后，会出现2px边框，这里宽高要各减4px，四边框才都会出现*/
#index_b_hero .heros { width:1100px;height: 350px; }
#index_b_hero .hero-wrap { overflow: visible; position: absolute; }
#index_b_hero .next, #index_b_hero .prev { position: absolute; top: 150px; z-index: 3; }  /*左右两侧图标位置(上下)*/
#index_b_hero .next { right: 0; }
#index_b_hero .disabled { background-color: #eee; }
#index_b_hero .mask-left, #index_b_hero .mask-right, #index_b_hero .hero { z-index: 1; position: absolute; top: 0; left: 0; width:1100px; height: 350px; overflow: hidden; left: 2200px; }
#index_b_hero .mask-right, #index_b_hero .mask-left { z-index: 4; left: -1100px; filter: alpha(Opacity=70); opacity: .7; background: #000; overflow: hidden; }
#index_b_hero .mask-right { left: 1100px; }