function setCookie(c_name,value,exdays){
    var exdate=new Date();
    exdate.setDate(exdate.getDate() + exdays);
    var c_value=escape(value) + ((exdays==null) ? "" : "; expires="+exdate.toUTCString());
    document.cookie=c_name + "=" + c_value;
}

function getCookie(c_name){
var i,x,y,ARRcookies=document.cookie.split(";");
for (i=0;i<ARRcookies.length;i++)
{
  x=ARRcookies[i].substr(0,ARRcookies[i].indexOf("="));
  y=ARRcookies[i].substr(ARRcookies[i].indexOf("=")+1);
  x=x.replace(/^\s+|\s+$/g,"");
  if (x==c_name)
    {
    return unescape(y);
    }
  }
}
function closeBanner() {
    var myBanner = document.getElementById("popup-banner");
    myBanner.setAttribute('style','display:none');
    var myShadow = document.getElementById("banner-shadow");
    myShadow.setAttribute('style','display:none');
}
    
function checkCookie(){
var banner_show=getCookie("banner_show");
    if(banner_show == null ){
        banner_show = 0;
    }else{
        banner_show=parseInt(banner_show);
    }
  if (banner_show <= 5)
  {
    setCookie("banner_show", banner_show+1, "Mon, 01-Jan-2013 00:00:00 GMT");
    var banner = document.createElement('div');
    var banner_shadow = document.createElement('div');
    var close_banner = document.createElement('div');
    /*  Заменить background:banner.jpg на путь к реальной картинке.! */
    banner.innerHTML="<a href='http://ukrposhta.ua'><img src ='http://www.ukrposhta.com/www/upostua.nsf/popup.png' alt=''/></a>";

    document.getElementsByTagName("body")[0].appendChild(banner);
    document.getElementsByTagName("body")[0].appendChild(banner_shadow);

    /*  Заменить background:banner.jpg на путь к реальной картинке.! */
    banner.setAttribute('style','position:absolute;width:728px;height:386px;background:red;z-index:9999;top:10%;left:50%;margin-left:-364px');
    /* Заменить background:banner.jpg на путь к реальной картинке. */
    banner_shadow.setAttribute('style','position:fixed;width:100%;height:100%;background:black;z-index:999;top:0;left:0;opacity:0.7');
    banner_shadow.setAttribute('id','banner-shadow');
    banner.setAttribute('id','popup-banner');
    close_banner.setAttribute('style','position:absolute;width:20px;height:20px;cursor:pointer;z-index:1;top:15px;right:15px');
    document.getElementById("popup-banner").appendChild(close_banner);
    close_banner.addEventListener("click", closeBanner, false);
  }else {}
 }
 
 checkCookie();