var winerrormessage = null;
function openWindow(URL, name, features)
{
    if ( winerrormessage != null )
    {
        if ( ( document.all ) || ( winerrormessage.isLoaded ) )
        {
            winerrormessage.close();
        }
        winerrormessage = null;
    }
    winerrormessage = window.open(URL, name, features);
    if ( winerrormessage != null )
        winerrormessage.focus();
}

function doCloseWindow()
{
    if ( winerrormessage != null )
    {
        if ( !winerrormessage.closed )
        {
            winerrormessage.close();
        }
    winerrormessage = null;
    }
}