请教:怎么用javascript直接隐藏当前窗口的地址拦

function  openwin()  {
                       n  =  window.open("","_self","location=no,toolbar=yes,status=yes,menubar=yes,resizable=yes,scrollbars=yes");
                       n.document.write("<head>")
                       n.document.write("<title>无标题文档</title>")
                       n.document.write("</head><body></body></html>")
           }  can not hidden location bar. HELP please!