Loading Custom JQuery code on the WordPress Login Page (wp-login.php)

You don’t provide a link to your site or show the code you’re using, so there’s no way to give you a specific suggestion.

You might try using Firefox with the Firebug extension. It’s great for debugging javascript. You may just have a simple error in the JQuery you added that’s preventing it from running; Firebug will tell you where to look.

It looks like it conflicts with other plugins etc. and has to be set up to add your own custom coding, but I found a JQuery noConflict Wrapper that can be placed around some of your code to wrork:

jQuery(document).ready(function($) {
    // $() will work as an alias for jQuery() inside of this function
});

Just a note, it doesn’t look like jQuery is actually loaded on the log in page.

Force jQuery to be loaded on the log in page:

add_action( 'login_enqueue_scripts', 'custom_login_enqueue_scripts' );
function custom_login_enqueue_scripts()
{
	wp_enqueue_script('jquery');
}