<style>
#main { position: absolute; display: none; top: 0px; left: 0px; background-color: #fff }
#modalbox { width: 300px; height: 200px; border: 1px solid #ECC113; position: absolute; background-color: #FFEFAF; display:
none; z-index: 2 }
div#shade { background-color: #ECECEC; width: 300px; height: 200px; position: absolute; display: none; z-index: 1 }
.log { text-decoration: underline; cursor: pointer; color: #ff0000 }
#caption { background-color: #FF6826; border-bottom: 1px solid #fff; color: #fff; font: 11px verdana; padding: 4px;
font-weight: bold }
#body { padding: 10px; font: 11px verdana; padding-top: 15px; text-align: center }
#body table { font: 11px verdana }
#body a { color: #FF6600 }
.but { font: 11px verdana }
</style>
<body> <span class="log" onclick="ShowModalbox()">Войти</span>
<div id="shade"></div>
<div id="modalbox" style="filter: alpha(opacity=100)">
<div id="caption" style="filter: alpha(opacity=100)">Название окна (меняете на свое)</div>
<div id="body">
Тут ваши данные (например $LOGIN_FORM$)
</div>
</div>
<div id="main"></div>
</body>
<script>
var modalbox;
var shade;
var scrollWidth;
var scrollHeight;
window.onload = function() {
modalbox = document.getElementById("modalbox");
shade = document.getElementById("shade");
scrollWidth = document.body.scrollWidth;
scrollHeight = document.body.scrollHeight;
document.getElementById("main").style.width = scrollWidth;
document.getElementById("main").style.height = scrollHeight;
}
function ShowModalbox() {
document.getElementById("main").style.filter = "alpha(opacity=80)";
document.getElementById("main").style.opacity = 0.8;
document.getElementById("main").style.display = "block";
modalbox.style.display = "block";
shade.style.display = "block";
posleft = Math.round(scrollWidth / 2) - 150;
postop = document.body.scrollHeight - 600;
shade.style.left = posleft + 7;
shade.style.top = document.body.scrollTop + 307;
modalbox.style.left = posleft;
modalbox.style.top = document.body.scrollTop + 300;
}
function LogIn() {
HideModalbox();
document.location.href = "тут ссылка на ваш сайт";
}
function HideModalbox() {
document.getElementById("main").style.display = "none";
modalbox.style.display = "none";
shade.style.display = "none";
}
</script>
