#pop {
   z-index:1200;
    position:    fixed;
    top:         50%;
    left:        50%;
    width:        640px;
    height:       480px;
    margin-left: -3px;
    margin-top:  -240px;
}
#cerrar {
   float:right;
   margin-right:0px;
   cursor:pointer;
   font:Verdana, Arial, Helvetica, sans-serif;
   font-size:20px;
   color:#FFFFFF;
   background-color:#E04B36;
   width:20px;
   position:relative;
   margin-top:-1px;
   text-align:center;
}