Customize Login Page Wordpress

Change the Logo
--------------------------
Is the WordPress logo by default, this changes the file path of that image. Change file path and file name to your own needs.

function custom_login_logo() {
    echo '<style type="text/css">h1 a { background: url('.get_bloginfo('template_directory').'/images/logo-login.gif) 50% 50% no-repeat !important; }</style>';
}
add_action('login_head', 'custom_login_logo');

Change the URL
-----------------
of where clicking that logo goes. By default it goes to WordPress.org, this will change it to your own homepage.

function change_wp_login_url() {
    return bloginfo('url');
}
add_filter('login_headerurl', 'change_wp_login_url');

Change the Title
--------------------
That is, change the title attribute of the image you just replaced. This changes it to the name of your blog in the settings.

function change_wp_login_title() {
    return get_option('blogname');
}
add_filter('login_headertitle', 'change_wp_login_title');