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function my_login_logo(){
 echo '
 <style type="text/css">
 #login h1 a { background: url("<?php echo get_template_directory_uri(); ?>/images/logo.png") no-repeat 50% 50% !important; }
 </style>';
}
add_action('login_head', 'my_login_logo');
 
add_filter( 'login_headerurl', create_function('', 'return get_home_url();') );
 
add_filter( 'login_headertitle', create_function('', 'return false;') );