hola de nuevo..! probé la forma e inserte el codigo como me lo recomedaste pero no tube exito...el link marca un error en el navegador y no abre el popup
te dejo el codigo tal ves hice algo mal... 
 
salu2! 
codido: 
<
script language="javascript" type="text/javascript">
function ventana(){
window.open('popdan.htm'  'popup'toolbar='no','width='400' , height='500');
}
</script><script language="JavaScript">
<!--
function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}
function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
} 
function MM_preloadImages() { //v3.0
 var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
   var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
   if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
} 
function mmLoadMenus() {
  if (window.mm_menu_0524190114_0) return;
  window.mm_menu_0524190114_0 = new Menu("root",67,18,"Arial, Helvetica, sans-serif",12,"#000000","#009999","#ffffff","#ffffff",  "left","middle",3,0,1000,0,0,true,true,true,1,true  ,true);
  mm_menu_0524190114_0.addMenuItem
("Danone","location='javascript:ventana('popdan.ht  m',400,500)'");
  mm_menu_0524190114_0.addMenuItem("Sigma");
  mm_menu_0524190114_0.addMenuItem("Alpura");
  mm_menu_0524190114_0.addMenuItem("Sello Rojo"  );
  mm_menu_0524190114_0.addMenuItem("Nestle");
   mm_menu_0524190114_0.hideOnMouseOut=true;
   mm_menu_0524190114_0.menuBorder=1;
   mm_menu_0524190114_0.menuLiteBgColor='#ffffff';
   mm_menu_0524190114_0.menuBorderBgColor='#006666';
   mm_menu_0524190114_0.bgColor='#ffffff'; 
  mm_menu_0524190114_0.writeMenus();
} // mmLoadMenus()