spacedog

I have this blog that already has posts, images, links & the sidebar & footer & header template have already been edited to appear the way I want them. etc,

anyway, I ftp a theme I want to use. What I am wondering is, if I select this in the themes option in admin, is all the content, posts, links, etc of the current active blog going to be transfered to the new theme? What about the sidebar template & headr & footer? will this all need to be done all ove again