/** Popup functions */

function popup(link, width, height) {
    iWidth = screen.width;
    iHeight = screen.height;
    wt = width;
    ht = height;
    lt = (iWidth - wt) / 2;
    tp = (iHeight - ht) / 2;
    window.open(link, 'popup', 'height='+ht+',width='+wt+',top='+tp+',left='+lt+',toolbar=no,scrollbars=yes,fullscreen=no,resizable=yes');
}

function popupRights(link) {
    popup(link, 500, 400);
}

function popupHelp(file) {
    popup(file, 700, 500);
}