I have a news website which I need to update everyday. But whenever I want to change the layout of the website I need to change the layout of every pages (which is not possible as there are many pages in a news websites).

Can anyone tell me a method or name any software which would help me to change the layout as my wish. And after changing the layout, all the pages also changes the layout automatically (without changing the main content or news area, because it is the single thing which is different in every page).

And I am using HTML and Css just for your reference.

I am helpless. Please help me.