here goes the html and css part , copt past :))
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script src="lh.js" type="text/javascript"></script>
<style type="text/css">
#user_warn{
height:300px;
width:200px;
background-color:#333333;
visibility:hidden;
margin:auto;
}
body {
background-color: #000000;
}
</style>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
</head>
<body>
<div id="user_warn">
</div>
<br/>
<input name="show" title="show" type="button" value="show" onclick="javascript:toggleMe();"/>
</body>
</html>
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java script code -> following , when you save this save it as a "lh.js".
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function toggleMe(demodiv,iState){
var e=document.getElementById("user_warn");
if(!e)return true;
if(e.style.display=="none"){
e.style.display="block"
e.style.visibility = "visible";
} else {
e.style.display="none"
}
return true;
}
fire fox will be good :))