Header Logo

<?php

//This replaces header_style function in functions.php
function header_style() {
if(!get_header_image() ) return;
?>
<style type="text/css">
#header-logo{
    background: url(<?php header_image(); ?>) no-repeat;
    float: left;
    height: <?php echo HEADER_IMAGE_HEIGHT; ?>px;
    width: <?php echo HEADER_IMAGE_WIDTH; ?>px;
    margin: 0;
    overflow: hidden;
    color: transparent;
}
#header h1 a{display:none;}
#tagline_text{display:none;}
</style>
<?php
}

//This goes in header-logo.php
<?php if(!get_header_image() ) : ?>
<div id="header-logo" onclick="location.href='<?php bloginfo('url'); ?>'" style="cursor: pointer;" >
    <img src="<?php header_image(); ?>" alt="<?php bloginfo('name'); ?>" />
</div>
<?php endif; ?>

<!-- This change second line only in Header.php -->
<div id="header">
<?php get_template_part( 'header', 'logo' ); //Add in the Logo ?>
<h1 id="logo_text"><a href="<?php echo home_url(); ?>"><?php echo bloginfo('name'); ?></a></h1>
<p id="tagline_text"><?php echo get_bloginfo ( 'description' );  ?></p>
</div>