.disable_background {
   background-color: Black;
   position: absolute;
   width: 105%;
   height: 100%;
   left: 0px;
   top: 0px;
   opacity:0.5;
   filter:alpha(opacity=50);
}

.close_popup_btn {
   cursor:pointer;
   position:absolute;
   background-image:url();
   height:25px;
   background:#7dbd00 url('../img/close.png') no-repeat right top;
}