body
{
  
  
}
.bodybj
{
     position: absolute;
    width: 100%;
    margin: 0 auto;
    z-index: -160;
    top:224;
    left:0;
    background: url('bjtwo.jpg') repeat-y center;
    }
.chunbj
{
   background: url('chun.png') no-repeat center; height:673px; width:100%; position:absolute; z-index:-88; bottom:0;left:0;
}
.xiabj
{
   background: url('xia.png') no-repeat center; height:673px; width:100%; position:absolute; z-index:-88; bottom:0;left:0
}
.qiubj
{
    background: url('qiu.png') no-repeat center; height:673px; width:100%; position:absolute; z-index:-88; bottom:0;left:0
}
.dongbj
{
    background: url('dongbj.png') no-repeat center; height:673px; width:100%; position:absolute; z-index:-88; bottom:0;left:0
}