I am, like many others, trying to move from html to xhtml and CSS insted of tables etc. I'm working on a design with some divs. A header, a content area with margins containing links to the left and right, and a footer with copyright information.The problem is, the divs for the margins are only as big as the data inside them, I want them to be just as high as the content area, otherwise there will be white spaces if I color the margins. I can't define hight for the margins as I don't know how big the content area will be, it will probably vary from page to page.I'm pretty bad at this, help me.