function displayWindow(url, width, height, scroll, tools) {
    x = (640 - width) / 2,
    y = (480 - height) / 2;
    nWidth = width;
    nHeight = height;
    if (screen) {
        y = (screen.availHeight - height) / 2;
        x = (screen.availWidth - width) / 2;
    }
    if (screen.availWidth > 1800) {
        x = ((screen.availWidth / 2) - width) / 2;
    }
    window.open(url, 'newWin', 'scrollBars=' + scroll + ',toolbar=' + tools + ',width=' + width + ',height=' + height + ',screenX=' + x + ',screenY=' + y + ',top=' + y + ',left=' + x);
}