I am working on building my first wordpress theme. The design I'm working on includes a header section followed by a horizontal navigation bar then a content area with a left and a right sidebar with a content section in the middle with a footer below. I'm getting this layout together and the thing that is getting me is positioning the three columns in the content area. Its showing me how little I know about CSS. My question is can any of you point me to a good tutorial on CSS specific for this kind of thing or provide any tip or advice for position a multicolumn theme?