Howdy!
Today I will give you a quick run down on how to change the Navbar (Fat Mum Slim showed a similar idea here) and centre your Pages tabs on your blogspot blog.
The code you need (which I talk about in the video) is below. Just copy and paste it.
Navbar
#navbar-iframe{opacity:0.0;filter:alpha(Opacity=0)}
#navbar-iframe:hover{opacity:1.0;filter:alpha(Opacity=100, FinishedOpacity=100)}
Pages Tabs
.PageList li a {
margin-right: 10px;
}
.PageList {text-align:center !important;}
.PageList li {display:inline !important; float:none !important;}
Hope this helps! Happy blogging.