#mask {
position:fixed;
left:0;
top:0;
width:100%;
height:100%; 
z-index:9000;
background-color:#000;
display:none;
}

#boxes .window {
  position:absolute;
  left:0;
  top:70px !important;
  width:750px;
  height:100%;
  display:none;
  z-index:9999;
 }
a.close_button{background:url(../images/close.png) top no-repeat; width:30px; height:26px; display:block; float:right; margin:15px 145px 0 0}