I think on mine I use:
Code
<div id="header"></div>

Then in my styles I add to the extra css:
Code
#header {
height: 200px;
background: url('http://www.mysite.tld/images/image.gif');
background-repeat: no-repeat;
}

I like this method as you can rely on the style to choose the proper header image for different color schemes.

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