function str_replace(search, replace, subject) {
    // http://kevin.vanzonneveld.net
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Gabriel Paderni
    // +   improved by: Philip Peterson
    // +   improved by: Simon Willison (http://simonwillison.net)
    // +    revised by: Jonas Raoni Soares Silva (http://www.jsfromhell.com)
    // +   bugfixed by: Anton Ongson
    // +      input by: Onno Marsman
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +    tweaked by: Onno Marsman
    // *     example 1: str_replace(' ', '.', 'Kevin van Zonneveld');
    // *     returns 1: 'Kevin.van.Zonneveld'
    // *     example 2: str_replace(['{name}', 'l'], ['hello', 'm'], '{name}, lars');
    // *     returns 2: 'hemmo, mars'
 
    var f = search, r = replace, s = subject;
    var ra = r instanceof Array, sa = s instanceof Array, f = [].concat(f), r = [].concat(r), i = (s = [].concat(s)).length;
 
    while (j = 0, i--) {
        if (s[i]) {
            while (s[i] = (s[i]+'').split(f[j]).join(ra ? r[j] || "" : r[0]), ++j in f){};
        }
    };
 
    return sa ? s : s[0];
}
var domena = str_replace('www.', '', document.domain);
var cookie_agreement = "agreement";
var domain = document.domain.match(/[a-zA-Z0-9\-\_]+\.[a-zA-Z]{2,4}$/);

var vars = domena.split(".");
if(vars.length==2){ var rstring = "("+vars[0]+"."+vars[1]+")"; }
if(vars.length==3){ var rstring = "("+vars[0]+"."+vars[1]+"."+vars[2]+")"; }
var referrer = document.referrer.match(rstring);

var disclaimer = "Následující stránky obsahují fotky a videa s sexuální tématikou. \n\n Není li Vám ještě 18let odejděte prosím.";
if(!domain) domain = document.domain;

if(referrer) { document.cookie = cookie_agreement+"=true;;path=/;domain=."+domain; }

if(document.cookie.indexOf(cookie_agreement) == -1) {
    if(confirm(disclaimer)) document.cookie = cookie_agreement+"=true;;path=/;domain=."+domain;
    else document.location.href = "./es_no.php";
}