.adbt{ width:50%; height:800px; display:block; overflow:hidden; position:fixed; left:0; top:29px; z-index:1;background:no-repeat right 490px top url(/skin/library/images/ztbt-left.jpg);}
.adbt .adbtbg{ width:100%; height:800px; position:absolute; left:0; top:0; display:block; overflow:hidden}

.adbt-right{ width:50%; height:800px; display:block; overflow:hidden; position:fixed; left:50%; top:29px; z-index:1;background:no-repeat left 490px top url(/skin/library/images/ztbt-right.jpg);}
.adbt-right .adbtbg{ width:100%; height:800px; position:absolute; left:0; top:0; display:block; overflow:hidden}


.affix{ position:fixed; top:0;}

.main{ position:relative; zoom:1; z-index:10;}
.top{ margin-bottom:0}