function keyDown(e) {
    var keynum;
    
    if (window.event) { // IE
        keynum = e.keyCode;
    }
    else if (e.which) {
        keynum = e.which;
    }
    if (keynum == 27) {
        hide_popup();
    }
}
function hide_popup(el) {
    document.getElementById('overlay').style.display = "none";
    document.getElementById('popup').style.display = "none";
    //clearTimeout(t);
}