Is there a way to hide the google toolbar in my browser programmable?
You haven't said which browser you are using so I'm going to assume Internet Explorer* and answer No.
If JavaScript on a web page could manipulate the browser, it would be a serious security hole and could create a lot of confusion for users.
So no... for a good reason: Security.
*. If you were using Firefox, and were talking about JavaScript within an extension to manipulate and theme the window chrome then this would be a different story.
As far as I know, you cannot access these parts of the browser due to security issues. But you can load new browser windows without toolbars as such. I don't know exactly how (hopefully other users will help yout out), but maybe start here: http://www.experts-exchange.com/Web/Web_Languages/JavaScript/Q_20782379.html
(PS: I know, it's experts-exchange, but I'm not going to copy someone elses work, even if it's posted on EE).