function centerPopup(w,h) {
    x = 0;
    y = 0;
    if (screen) {
        w = (w > screen.width) ? screen.width : w;
        h = (h > screen.height) ? screen.height : h;
        x = screen.width - w;
        y = screen.height - h;
		if (x > 0) { x = x / 2; } else { x = 0; }
        if (y > 0) { y = y / 4; } else { y = 0; }
    }
    cords = new Array(x,y,w,h);
    return cords;
}

function pop_kontakt(link) {
    cords = centerPopup(564,500);
    winoptions = "width=" + cords[2] + ",height=" + cords[3];
    winoptions = winoptions + ",resizable=yes,menubar=no,personalbar=no,scrollbars=yes,statusbar=no";
    win2=window.open(link,"kontakt", winoptions);
    win2.moveTo(cords[0], cords[1]);
    win2.focus();
    return(false);
}