<?php
if (is_page('contact')){
	<?php include(TEMPLATEPATH.'/headercontact.php'); ?>
}
elseif (is_page('gallery')){
	<?php include(TEMPLATEPATH.'/headergallery.php'); ?>
}
else {
	<?php include(TEMPLATEPATH.'/headerdefault.php'); ?>
}
?>

http://www.wprecipes.com/how-to-use-multiple-custom-headers-on-a-wordpress-theme

The first thing to do is to create header files. Create as many different headers as you want. In this exemple, I have created 3 custom headers from my theme default file header.php, names headercontact.php, headergallery.php and headerdefault.php.

By using the php include() function and WordPress conditional tags, we can define custom headers easily.
Replace the content of your header.php file with the following code:

Use multiple custom headers on a WordPress theme

header, wordpress

PHP