Real noob question - default layout and elements

Hi,

Pretty much just starting out with cake - im sure its a simple
solution but cant get my head around it:
I have set up my default template layout - now in my template i have a
header and a body section, in the header I want to display an element
"banner" but ONLY display this element on the homepage - how do I do
this?
I was thinking of having a separate layout which will pretty much be
an exact copy of the default.ctp layout with the only difference being
the addition of the banner element - then having my controller switch
to this layout for the homepage - but isn't this breaking the DRY
principle? If I make a small change to the default.ctp layout (add a
new javascript file for instance), then I'd have to change the new
layout file too (since this is pretty much an exact copy of the
default layout file).

Surely there is an easier and more efficient solution - or is my
understanding of layouts completely off target?

So pretty much ... what is the best/most efficient way to include a
banner element in my layout but only have it displaying on the home
page?

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