var popUpWin = 0;

function popUpWindow(URLStr, title)
{
    if (popUpWin)
    {
        if (!popUpWin.closed) popUpWin.close();
    }
    popUpWin = open(URLStr, title, 'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=1,width=940,height=600');
}