function popup(mylink, windowname, _width, _height)
      {
        if (!window.focus) return true;

        var href;
        if (typeof(mylink) == 'string')
            href=mylink;
        else
            href=mylink.href;


        mywindow = window.open(href, windowname, 'left=200,top=50,resizeable=0,toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0');
        mywindow.resizeTo(_width, _height);
      
        return false;
      }