Thank you Leonid, - but my users will be not that much technically.
They come from google and see a blog, but whenthe site is not loaded in the frame, they will have no clue, that a header exists. So i hope that there is a way to check if the site is loaded insinde a frame - and when not, - to reload the site into this.
My problem is, that i like to have users from Google and UNA is not much SEO optimized - so i need to load wordpress into the una site (iframe) to have more SEO options.
But when the Blog pages where found on google, - they will be wordpress sites without the header of una. So i have to load the header after the user opens it on google search results.
I can have a second header to point to mainframe of UNA - but this will look ugly.