Full width header with Artisteer 2.4 template

Hi,

I want to have a full width header but I really do not know if it would be possible to wrap such a header , this is my website
http://systemes-d-alarme.beta.commentchoisir.info/traitementair/
and the one I use as a model which has a full width header is this one:
http://chauffage-electrique.commentchoisir.info/
Thank you guys