To hide the Blogger Navbar :

1- Log in to blogger
2. on your Dashboard, select layout. This will take you to the Template tab. Click Edit HTML.Under the Edit Template section you will see you blog's HTML.
3. Paste the CSS definition in the top of the template code:






-----------------------------------------------
Blogger Template Style
Name: 122we03
Designer: zarest
URL: http://zarestpermana.blogspot.com
Date: Februari 2009
----------------------------------------------- */

#navbar-iframe { display: none !important;}

/ * Variable definitions
====================
type="color" default="#fff" value="#ffffff">
default="#333" value="#333333" >

Remove the code to show it again .