.pds{
     width:949px;
     margin:0 auto;
     position:relative;
}
.left{
      float:left;
      width:500px;
}
.leftin{
      float:left;
      width:250px;
}
.rightin{
      float:right;
      width:250px;
}
.cprght{
        width:949px;
        margin:0 auto;
        position:relative;
}