.faussePopupAttente{
    position:absolute; 
    top:0px; 
    left:0px; 
    z-index:200; 
    display : none; 
    background-color: #FFFFFF; 
    width:1px; height:1px;
   filter:alpha(opacity=60);
   -moz-opacity:0.5;
   opacity: 0.5;
}