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<script type="text/javascript">
/* This script and many more are available free online at
The JavaScript Source!! http://javascript.internet.com
Created by: Steve Chipman | http://slayeroffice.com/ */

// constants to define the title of the alert and button text.
var ALERT_TITLE = "Oops!";
var ALERT_BUTTON_TEXT = "Close";

// over-ride the alert method only if this a newer browser.
// Older browser will see standard alerts
if(document.getElementById) {
  window.alert = function(txt) {
    createCustomAlert(txt);
  }
}

function createCustomAlert(txt) {
  // shortcut reference to the document object
  d = document;

  // if the modalContainer object already exists in the DOM, bail out.
  if(d.getElementById("modalContainer")) return;

  // create the modalContainer div as a child of the BODY element
  mObj = d.getElementsByTagName("body")[0].appendChild(d.createElement("div"));
  mObj.id = "modalContainer";
   // make sure its as tall as it needs to be to overlay all the content on the page
  mObj.style.height = document.documentElement.scrollHeight + "px";

  // create the DIV that will be the alert
  alertObj = mObj.appendChild(d.createElement("div"));
  alertObj.id = "alertBox";
  // MSIE doesnt treat position:fixed correctly, so this compensates for positioning the alert
  if(d.all && !window.opera) alertObj.style.top = document.documentElement.scrollTop + "px";
  // center the alert box
  alertObj.style.left = (d.documentElement.scrollWidth - alertObj.offsetWidth)/2 + "px";

  // create an H1 element as the title bar
  h1 = alertObj.appendChild(d.createElement("h1"));
  h1.appendChild(d.createTextNode(ALERT_TITLE));

  // create a paragraph element to contain the txt argument
  msg = alertObj.appendChild(d.createElement("p"));
  msg.innerHTML = txt;
 
  // create an anchor element to use as the confirmation button.
  btn = alertObj.appendChild(d.createElement("a"));
  btn.id = "closeBtn";
  btn.appendChild(d.createTextNode(ALERT_BUTTON_TEXT));
  btn.href = "#";
  // set up the onclick event to remove the alert when the anchor is clicked
  btn.onclick = function() { removeCustomAlert();return false; }
}

// removes the custom alert from the DOM
function removeCustomAlert() {
  document.getElementsByTagName("body")[0].removeChild(document.getElementById("modalContainer"));
}
</script>

<style>
#modalContainer {
 background-color:transparent;
 position:absolute;
 width:100%;
 height:100%;
 top:0px;
 left:0px;
 z-index:10000;
}

#alertBox {
 position:relative;
 width:300px;
 min-height:100px;
 margin-top:50px;
 border:2px solid #000;
 background-color:#F2F5F6;
 background-image:url(alert.png);
 background-repeat:no-repeat;
 background-position:20px 30px;
}

#modalContainer > #alertBox {
 position:fixed;
}

#alertBox h1 {
 margin:0;
 font:bold 0.9em verdana,arial;
 background-color:#78919B;
 color:#FFF;
 border-bottom:1px solid #000;
 padding:2px 0 2px 5px;
}

#alertBox p {
 font:0.7em verdana,arial;
 height:50px;
 padding-left:5px;
 margin-left:55px;
}

#alertBox #closeBtn {
 display:block;
 position:relative;
 margin:5px auto;
 padding:3px;
 border:1px solid #000;
 width:70px;
 font:0.7em verdana,arial;
 text-transform:uppercase;
 text-align:center;
 color:#FFF;
 background-color:#78919B;
 text-decoration:none;
}
</style>

<input type="button" value = "Test the alert" onclick="alert('This is a custom alert dialog that was created by overriding the window.alert method.');">

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