Header Author Sample

<?php
//Get the Author image by Digital Raindrops
function dr_author_header() {
    $style="";
    if ( is_page() || is_single() ) {
        $authorid =  $post[0]->post_author;
        $slug = the_author_meta('user_nicename', $authorid );
        if ( file_exists( get_template_directory_uri() .'/images/'.$slug.'.png' ) ) {
            $link = the_author_meta( 'user_url', $authorid );
            //Get author image by and the author url
            $style = ' style="background-image: url(' .get_template_directory_uri() .'/images/'.$slug.'.png);" ';
            $style = $style .'  onclick="location.href='.$link.'" ';
        }
    }
    return $style;
}
?>

<?php
    //See if we want to swap the header banner and add a link
    $style=dr_author_header();
?>
    <div class="header-png"<?php echo $style; ?>></div>