Header tags

From CSS Standards FAQ

Headers tags (<h[1-6]>) is used for headers/titles in your document. They should be used in proper order. This means you should not skip from <h1> to <h3> but to <h2>. Too easily check if your document complies to this, use the "outline" feature of the w3c validator. It will display you an outline of your document based on your use of header tags. People often use <h1> for the site name (eg. "CSS FAQ" for this document) of the document and uses image replacement to display graphics instead of text. In some cases you might want to use an <img> tag instead of text if it is the logo of your company or something similar. If it's purely design you should however be using a image replacement method.