var popUpWindow;

function openPopUpWindow(Url, Width, Height, Scrollbars)
{

    var DefaultHeight = 670;
    var DefaultWidth = 600;
    var DefaultScrollbars = "yes";

    if (Height == null) { Height = DefaultHeight; }
    if (Width == null) { Width = DefaultWidth; }
    if (Scrollbars == null) { Scrollbars = DefaultScrollbars; }

    if (popUpWindow && !popUpWindow.closed) { popUpWindow.document.location.href = Url; }
    else
    {
        popUpWindow = window.open(Url, "popUpWindow", "scrollbars=" + Scrollbars + ",status=no,resizable=no,top=200,left=200,width=" + Width + ",height=" + Height);
    }
}

function closePopUpWindow(Url)
{
    opener.focus();
    if (Url != null) { opener.location.href = Url; }
    window.close();
    return false;
}