Change WP Login Image

change-wp-login-image.php

<?php
/* ------------------------------------------------------------------ */
// Custom Login Image
// http://wp.tutsplus.com/tutorials/customizing-wordpress-for-your-clients/

function my_custom_login_logo()
{
    echo '<style  type="text/css"> h1 a {  background-image:url(/assets/img/spLogo.png)  !important; } </style>';
}
add_action('login_head',  'my_custom_login_logo');
?>