wordpress migration

Hello,

I have this blog articles on my website http://www.clementchambaud.com/blog/ that I want to move to another website http://www.declencheurfou.fr (which is still completely empty).

The import/export function does not work well with my hosting (it not downloading all the picture and I have to had them back manually.

I was thinking of doing it with Filezilla, but I don’t know exactly how to take all my articles (and just articles not pages) with their pictures.

Also, for now to connect to my log in my two website, i have two different wordpress panel. I was wondering if it is possible to have something to just change of website without log off/log in (I have this kind of thing in wordpress.com)

Thanks a lot