when you open a new window you might open it without the toolbar ... but you cannot/and shouldn't try to do that with the 'base' browser-window ... it is one of the most annoying things with webapps that try to change the users browsersettings like toolbars, size etc. .... the user has his own preferences and a webpage/-app shouldn't try to change that settings ...
that even goes for the typical browser behaviour ... why not use the provided functionality? ... buttons, address-bar etc. are there for a reason so just let the user work with them as he knows how to use it. providing custom interfaces for 'settled' behaviour of software and thinking of users is often bad practice and design ... so i would like to recommend to avoid such attempts ... but in case you really need to provide your own navigation buttons and so on ... then you need to open a new window with the
window.open() method ...
kind regards