This is a very useful script for those of you that monetize your traffic through popups / popunders. It works the same way in which thepiratebay.org does: As soon as the user clicks anywhere on your page / links the popunder will launch. This way the popunder will avoid being detected by anti-popup apps:

<script>
var puShown = false;
var PopWidth = 1370;
var PopHeight = 800;
var PopFocus = 0;
var _Top = null;

function GetWindowHeight() {
var myHeight = 0;
if( typeof( _Top.window.innerHeight ) == 'number' ) {
myHeight = _Top.window.innerHeight;
} else if( _Top.document.documentElement && _Top.document.documentElement.clientHeight ) {
myHeight = _Top.document.documentElement.clientHeight;
} else if( _Top.document.body && _Top.document.body.clientHeight ) {
myHeight = _Top.document.body.clientHeight;
}
return myHeight;
}

function GetWindowWidth() {
var myWidth = 0;
if( typeof( _Top.window.innerWidth ) == 'number' ) {
myWidth = _Top.window.innerWidth;
} else if( _Top.document.documentElement && _Top.document.documentElement.clientWidth ) {
myWidth = _Top.document.documentElement.clientWidth;
} else if( _Top.document.body && _Top.document.body.clientWidth ) {
myWidth = _Top.document.body.clientWidth;
}
return myWidth;
}

function GetWindowTop() {
return (_Top.window.screenTop != undefined) ? _Top.window.screenTop : _Top.window.screenY;
}

function GetWindowLeft() {
return (_Top.window.screenLeft != undefined) ? _Top.window.screenLeft : _Top.window.screenX;
}

function doOpen(url)
{
var popURL = "about:blank"
var popID = "ad_" + Math.floor(89999999*Math.random()+10000000);
var pxLeft = 0;
var pxTop = 0;
pxLeft = (GetWindowLeft() + (GetWindowWidth() / 2) - (PopWidth / 2));
pxTop = (GetWindowTop() + (GetWindowHeight() / 2) - (PopHeight / 2));

if ( puShown == true )
{
return true;
}

var PopWin=_Top.window.open(popURL,popID,'toolbar=0,scrollbars=1,location=1,statusbar=1,menubar=0,resizable=1,top=' + pxTop + ',left=' + pxLeft + ',width=' + PopWidth + ',height=' + PopHeight);

if (PopWin)
{
puShown = true;

if (PopFocus == 0)
{
PopWin.blur();

if (navigator.userAgent.toLowerCase().indexOf("applewebkit") > -1)
{
_Top.window.blur();
_Top.window.focus();
}
}

PopWin.Init = function(e) {

with (e) {

Params = e.Params;
Main = function(){

if (typeof window.mozPaintCount != "undefined") {
var x = window.open("about:blank");
x.close();

}

var popURL = Params.PopURL;

try { opener.window.focus(); }
catch (err) { }

window.location = popURL;
}

Main();
}
};

PopWin.Params = {
PopURL: url
}

PopWin.Init(PopWin);
}

return PopWin;
}

function setCookie(name, value, time)
{
var expires = new Date();

expires.setTime( expires.getTime() + time );

document.cookie = name + '=' + value + '; path=/;' + '; expires=' + expires.toGMTString() ;
}

function getCookie(name) {
var cookies = document.cookie.toString().split('; ');
var cookie, c_name, c_value;

for (var n=0; n<cookies.length; n++) {
cookie  = cookies[n].split('=');
c_name  = cookie[0];
c_value = cookie[1];

if ( c_name == name ) {
return c_value;
}
}

return null;
}

function initPu()
{

_Top = self;

if (top != self)
{
try
{
if (top.document.location.toString())
_Top = top;
}
catch(err) { }
}

if ( document.attachEvent )
{
document.attachEvent( 'onclick', checkTarget );
}
else if ( document.addEventListener )
{
document.addEventListener( 'click', checkTarget, false );
}
}

function checkTarget(e)
{
if ( !getCookie('popundr') ) {
var e = e || window.event;
var win = doOpen('YOUR URL HERE');

setCookie('popundr', 1, 24*60*60*1000);
}
}

initPu();
</script>