function openPage( url, element_url )
{
  var ww = Components.classes["@mozilla.org/embedcomp/window-watcher;1"]
                     .getService(Components.interfaces.nsIWindowWatcher);
  var argstring = Components.classes["@mozilla.org/supports-string;1"]
                          .createInstance(nsISupportsString);
  argstring.data = element_url;

  var paramArray = Components.classes["@mozilla.org/supports-array;1"].createInstance(Components.interfaces.nsISupportsArray);
  paramArray.AppendElement( argstring );  
  var win = ww.openWindow(
    window,
    url,
    "_blank",
    "dialog=no,all",
     argstring );
// если здесь проверить win.arguments выставлен
}