Butona tıkladıgınızda Popup pencere acar

<script type="text/javascript">
var y1 = 20;   // change the # on the left to adjuct the Y co-ordinate
(document.getElementById) ? dom = true : dom = false;

function hideIt() {
  if (dom) {document.getElementById("layer1").style.visibility='hidden';}
  if (document.layers) {document.layers["layer1"].visibility='hide';} }

function showIt() {
  if (dom) {document.getElementById("layer1").style.visibility='visible';}
  if (document.layers) {document.layers["layer1"].visibility='show';} }

function placeIt() {
  if (dom && !document.all) {document.getElementById("layer1").style.top = window.pageYOffset + (window.innerHeight - (window.innerHeight-y1))}
  if (document.layers) {document.layers["layer1"].top = window.pageYOffset + (window.innerHeight - (window.innerHeight-y1))}
  if (document.all) {document.all["layer1"].style.top = document.body.scrollTop + (document.body.clientHeight - (document.body.clientHeight-y1));}
  window.setTimeout("placeIt()", 10); }

onResize="window.location.href = window.location.href"

td.top {
  background-color: #000080;
  text-align: right;

td.bottom {
  background-color: #ffe38c;
  padding: 15px;

<div id="layer1" style="position:absolute; left:20px; width:410px; height:10px; visibility:hidden;">
<table border="0" cellspacing="0" cellpadding="3">
  <td class="top">
       <a href="javascript:hideIt()" style="text-decoration: none"><font color="#ffffff"><b>X</b></font></a>
  <td class="bottom">
    Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt
    ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci.
    [<em>You can close the layer by clicking the <strong>X</strong> at the top right of this layer.</em>]

  <input type="button" value="Open popup" onClick="showIt()">