hm.. in general as a workaround you could try to click by hidden link in your js
Thanks for the tip.
Actually, this is what is done in our app. But I thought it would be cleaner if there is a "target" attribute in our jsFunction.
By the way, we can't achieve to use "rich:menuItem" with the "target" attribute.
By using the "target" attribute we expect to open a new browser window.
In some case, clicking on such menuItem raise a viewExpiredException et in other case the current page (but not the targeted one) is refreshed but with strange values in the form.
Thanks again for your time.