<style>
#progress{
display:none;
position: absolute;
top: 20%;
left: 20%;
width: 20%;
height: 20%;
background-color: black;
z-index:1001;
-moz-opacity: 0.8;
opacity:.70;
filter: alpha(opacity=88);
}
</style>
<javascript>
function popDiv(){
$("#progress").css("display","block");
}
</javascript>
<html>
<head><title></title></head>
<body>
<input type="button" value="popdiv" οnclick="popDiv()"/>
<div id="progress">xxx</div>
</body>
</html>