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<?php
// Change login logo
function custom_login_logo() {
  echo '<style type="text/css">h1 a { background: url('.get_bloginfo('template_directory').'http://cdn.css-tricks.com/images/logo-login.gif) 50% 50% no-repeat !important; }</style>';
}
add_action('login_head', 'custom_login_logo');
 
//  Change logo URL
function change_wp_login_url() {
  return bloginfo('url');
}
add_filter('login_headerurl', 'change_wp_login_url');
 
// Change login title
function change_wp_login_title() {
  return get_option('blogname');
}
add_filter('login_headertitle', 'change_wp_login_title');