function custom_login_logo() {
?>
<style>
.login #login h1 a {
width: 300px;
height: 63px;
background: url(<?php echo get_stylesheet_directory_uri(); ?>/images/logo_login.png) no-repeat 0 0;
}
</style>
<?php
}
add_action( ‘login_enqueue_scripts’, ‘custom_login_logo’ );