displaying partial webpages

[eluser]Unknown[/eluser]
i have read and googled a bit and honestly not sure how to frase the question to google to find the answer but how do you get codeigniter to display header and footer and such before i quere the database for the body information, I hate it when people are waiting for a page to load and there's nothing on screen. And some queries can be quite time consuming (this can't be avoided)

Thanks in advance