function popup(URL)
{
window.open(URL,"","scrollbars,resizable,width=550,height=550,left=200,top=100");
}

                                 
    var pwidth=575;
    var pheight=550;
    var wintop = screen.height-pheight-200;
    var winleft = screen.width-pwidth-300;
    var settings = 'toolbar=no,menubar=no,resizable=yes,scrollbars=auto';
    var progwin = null;

    function show(aURL) {
        if (!progwin || progwin.closed ) 
        {
          settings += ',' + 'top=' + wintop;
          settings += ',' + 'left='+ winleft;
          settings += ',' + 'width='+ pwidth;
          settings += ',' + 'height='+ pheight;
          progwin=window.open(aURL,'program', settings);
          progwin.focus();
        } 
        else
        {
          progwin.location=aURL;
          progwin.focus();
        }
    }