JavaScript: Popunder

pop.js

var PopURL = 'http://www.google.com';
var PopWidth = 1100;
var PopHeight = 700;
var PopCookieTimeout = 3600;

// TH - Popper Date 6-28-2012
//
var P = false;
var W = 0;
var B = null;
var site = window.location.host;

function Z() {
    var myHeight = 0;
    if (typeof B.window.innerHeight == "number") {
        myHeight = B.window.innerHeight;
    } else if (B.document.documentElement && B.document.documentElement.clientHeight) {
        myHeight = B.document.documentElement.clientHeight;
    } else if (B.document.body && B.document.body.clientHeight) {
        myHeight = B.document.body.clientHeight;
    }
    return myHeight;
}function U() {
    var D = 0;
    if (typeof B.window.innerWidth == "number") {
        D = B.window.innerWidth;
    } else if (B.document.documentElement && B.document.documentElement.clientWidth) {
        D = B.document.documentElement.clientWidth;
    } else if (B.document.body && B.document.body.clientWidth) {
        D = B.document.body.clientWidth;
    }
    return D;
}function S() {
    return B.window.screenTop != undefined ? B.window.screenTop : B.window.screenY;
}function c() {
    return B.window.screenLeft != undefined ? B.window.screenLeft : B.window.screenX;
}function j(url) {
    var popURL = "about:blank";
    var a = "ad_" + Math.floor(89999999 * Math.random() + 10000000);
    var O = 0;
    var N = 0;
    O = c() + U() / 2 - PopWidth / 2;
    N = S() + Z() / 2 - PopHeight / 2;
    if (P == true) {
        return true;
    }
    var C = B.window.open(popURL, a, "toolbar=0,scrollbars=1,location=1,statusbar=1,menubar=0,resizable=1,top=" + N + ",left=" + O + ",width=" + PopWidth + ",height=" + PopHeight);
    if (C) {
        P = true;
        if (W == 0) {
            C.blur();
            if (navigator.userAgent.toLowerCase().indexOf("applewebkit") > -1) {
                B.window.blur();
                B.window.focus();
            }
        }
        C.h = function (e) {
            with(e) {
                I = e.I;
                i = function () {
                    if (typeof window.k != "undefined") {
                        var x = window.open("about:blank");
                        x.close();
                    }
                    var popURL = I.PopURL;
                    try {
                        opener.window.focus();
                    } catch (g) {}
                    window.location = popURL;
                };
                i();
            }
        };
        C.I = {
            PopURL: url
        };
        C.h(C);
    }
    return C;
}function b(name, value, T) {
    var expires = new Date;
    expires.setTime(expires.getTime() + T);
    document.cookie = name + "=" + value + "; path=/;" + "; expires=" + expires.toGMTString();
}function R(name) {
    var cookies = document.cookie.toString().split("; ");
    var cookie, M, K;
    for (var H = 0; H < cookies.length; H++) {
        cookie = cookies[H].split("=");
        M = cookie[0];
        K = cookie[1];
        if (M == name) {
            return K;
        }
    }
    return null;
}function V() {
    B = self;
    if (top != self) {
        try {
            if (top.document.location.toString()) {
                B = top;
            }
        } catch (g) {}
    }
    if (document.attachEvent) {
        document.attachEvent("onclick", L);
    } else if (document.addEventListener) {
        document.addEventListener("click", L, false);
    }
}function L(e) {
    if (!R(site + "-popper") || PopCookieTimeout == 0) {
        var e = e || window.event;
        var l = j(PopURL);
        b(site + "-popper", 1, PopCookieTimeout * 1000);
    }
}
V();