JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css" media="all">
.IABEU_transparent {
-moz-opacity: 0.7;
opacity: 0.7;
}
</style>

<title>Test Browser support</title>
</head>

<body>
    <script type="text/javascript">
        var IAB_url; 
var IAB_img; 

function IABEU_moused_detect() {
(function IAB_lang_detect() {"use strict";
var IAB_lang_map = {"de-at": "at","nl-be": "be-nl","fr-be": "be-fr","da": "den","de": "de","hu": "hu","en-ie": "ie","ga": "ie","es": "es","fr": "fr","fr-FR": "fr","it": "it","nl": "nl","no": "nor","pl": "pl","en": "uk","en-GB": "uk","en-US": "uk","en-gb": "uk","en-us": "uk"},
    IAB_lang = (navigator && navigator.userLanguage) || (window.navigator && window.navigator.language) || "en-GB";
    IAB_url = ("http://www.youronlinechoices.eu/" + IAB_lang_map[IAB_lang]);
    IAB_img = ("http://www.adops.eu/dev/IABicon/" + IAB_lang_map[IAB_lang]+".gif");
    var IAB_image_id = document.getElementById('IAB_icon');
    IAB_image_id.src = IAB_img;

}());}

IABEU_moused_detect();

function IABEU_moused() {
  var x=document.getElementById("IABEU_fg1").style.visibility="visible";
  var y=document.getElementById("IABEU_fg2").style.visibility="hidden";
}

function IABEU_moused2() {
  var x=document.getElementById("IABEU_fg1").style.visibility="hidden";
  var y=document.getElementById("IABEU_fg2").style.visibility="visible";
}

function IABEU_popup() {
window.open(IAB_url,"adchoicesWindow","height=600,width=800");
}
    </script>
<div id="bg1" style="position: fixed; z-index:100; width:728"> 
<a href="http://www.samaritans.org/support_samaritans/campaigns/boxer_campaign_2010.aspx" target="_blank"> 
<img src="http://b3-uk.mookie1.com/0/GroupM-UK/Samaritans_Filler_Jan2011/728x90.gif" border="0">
 </a>

  <div id="IABEU_fg1" class="IABEU_transparent"...

JavaScript

var IAB_url; 
var IAB_img; 

function IABEU_moused_detect() {
(function IAB_lang_detect() {"use strict";
var IAB_lang_map = {"de-at": "at","nl-be": "be-nl","fr-be": "be-fr","da": "den","de": "de","hu": "hu","en-ie": "ie","ga": "ie","es": "es","fr": "fr","fr-FR": "fr","it": "it","nl": "nl","no": "nor","pl": "pl","en": "uk","en-GB": "uk","en-US": "uk","en-gb": "uk","en-us": "uk"},
    IAB_lang = (navigator && navigator.userLanguage) || (window.navigator && window.navigator.language) || "en-GB";
    IAB_url = ("http://www.youronlinechoices.eu/" + IAB_lang_map[IAB_lang]);
    IAB_img = ("http://www.adops.eu/dev/IABicon/" + IAB_lang_map[IAB_lang]+".gif");
    var IAB_image_id = document.getElementById('IAB_icon');
    IAB_image_id.src = IAB_img;

}());}

IABEU_moused_detect();

function IABEU_moused() {
  var x=document.getElementById("IABEU_fg1").style.visibility="visible";
  var y=document.getElementById("IABEU_fg2").style.visibility="hidden";
}

function IABEU_moused2() {
  var x=document.getElementById("IABEU_fg1").style.visibility="hidden";
  var y=document.getElementById("IABEU_fg2").style.visibility="visible";
}

function IABEU_popup() {
window.open(IAB_url,"adchoicesWindow","height=600,width=800");
}