registerEvent(window, "load", function(){
    var elements = getElementsByClassName("close", "A");
    for(var i=0; i<elements.length; i++){
        elements[i].href=document.referrer;
        registerEvent(elements[i], "click", closeClick);
    }
});

function closeClick(event){
    var ev = event || window.event;
    preventDefault(ev);
    window.close();
}