关于去掉titlebar的问题!!

本人在制作去掉titlebar时遇到下一个问题:
利用javascript去掉titlebar为no时却有去掉,查阅资料,有下面的方法不明白,请指教:
if set titlebar is no and if enhanced priviledged seurity access is granted y the user,then it would remove the titlebar from new secondary windows.
请问如何实现啊!

window.open 时候可以。如果是当前窗口则需要授权。

<script>
window.open("","","titlebar=0")
</script>

http://www.mozilla.org/projects/securit ... ample.html
http://www.mozilla.org/docs/dom/domref/ ... ml#1022017
http://61.185.204.40/david/showlog.asp? ... og_id=2090
http://61.185.204.40/david/showlog.asp? ... og_id=2089