function lh_openchatWindow(url,windowname)
{
    window.open(url+'?URLReferer='+escape(document.location),windowname,"menubar=0,resizable=0,width=450,height=420");	      
    return false;
}
var urlopen= "http://www.kontakt-online.dbajmyozdrowie.pl/index.php/pl/chat/startchat";
var windowname = "startchatwindow";

document.write('<div class="kontakt-online offline"><a href="javascript:;" onclick="lh_openchatWindow(urlopen,windowname)" onfocus="this.blur();">off-line</a></div>');