style type="text/css">
     
 
      #fade {
        position:absolute; 
      color: white;
	  width:100%;
	  height:100%;
		visibility:hidden;
		z-index:999;
	background: #404040;
         border: 1px solid indigo;
 		
      }
 
      </style>	  


function login(showhide){
var fade = document.getElementById('fade');
if(showhide == "show"){
	if(typeof IE == 'boolean'){
   		alert('IE');
		fade.style.filter = 'Alpha(Opacity=50)';
		fade.style.visibility="visible";
		document.getElementById('popupbox').style.visibility="visible";
		document.getElementById('popupbox').style.zIndex=1000;
	} else {
		alert('FF');
		fade.style.visibility="visible";
		 fade.style.opacity = 0.5;
		document.getElementById('popupbox').style.visibility="visible";
		document.getElementById('popupbox').style.zIndex=1000;
	}

} else if(showhide == "hide"){
document.getElementById('popupbox').style.visibility="hidden"; 
document.getElementById('fade').style.visibility="hidden"; 
}
}