function OpenWindow(query, w, h, scroll) {
    var l = (screen.width - w) / 2;
    var t = (screen.height - h) / 2;

    winprops = 'resizable=1, height=' + h + ',width=' + w + ',top=' + t + ',left=' + l + 'w';
    if (scroll) winprops += ',scrollbars=1';
    var f = window.open(query, "_blank", winprops);
}