Marcovidor’s solution is nice and neat, though if your header graphics are going to vary in size, it might not work so good (depends on the stylesheet and how you’re handling images).
If you want complete styling control over each header (i.e. size and position), there are a bunch of WordPress conditional tags that can tell what page your on. You could use them to load up different images, like Paldimo’s CSS.
Off the top of my head…
<?php if (is_front_page()) { ?>
<div id='frontPageBanner'>...</div>
<?php } elseif (is_archive()) { ?>
<div id='archiveBanner'>...</div>
<?php } elseif ( is_page($pageID)) {
<div id='pageIdBanner'>...</div>
?>
Then use CSS as Paldimo suggested.
#frontPageBanner { background-image...}
#archiveBanner { ... }
$pageID would need to be replaced by the actual numbers of the pages you are showing (if you hover over the page title in the edit pages screen, and look at the status bar in the bottom right hand corner, you’ll get the id number).
Obviously, there are limitations to using page ID numbers – if you add a new one, you’ll have to go into your header.php file and add another conditional statement, or if you delete and re-add a page, it’ll break, but using is_archive, is_front_page will work fine.
If your static pages are likely to remain, well, static, then this method will allow you to customise each page header individually.
BUT, if all your headers are the same size, use Marcovidor’s suggestion.
http://codex.wordpress.org/Conditional_Tags
