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";
}
}