question about layout and header

Hi,

I would like to get this result (please see screenshot above) where you have the nav bar then an image which is full screen large and underneath the blog section with the sidebar on the right.

https://www.dropbox.com/s/eg8n618xmz1w6ms/page_de_test_-_wordpress_et_webdesign_par_Christelle_Bourgeois.jpg

I can do it with the layer slider but as I want to do it on several pages concerning my blog posts I’m afraid it will slow down my site. Moreover I don’t need the interactive effect…I basically just need a banner I will make by myself.
So I was wondering if there was an alternative for me to get this result without a layer slider?
In fact I have tried with the other sliders but they don’t go on top of the sidebar…

Kind regards,

Chrys