function popupOdkazy() {
    if (!document.getElementsByTagName) return false;
    var links = document.getElementsByTagName("a");
    for (var i=0; i < links.length; i++) {
        if (links[i].className.match("noveokno")) {
            links[i].onclick = function() {
                return !window.open(this.href);
            }
        }
    }
    return true;
}
window.onload = popupOdkazy;