How to add jQuery scripts to wordpress?

Hi Everyone,

I have a quick question. I have been trying to add jQuery scripts to my site for hours and no luck. I was hoping to find some resolution here. I cannot get my jQuery script to work.

So I have a this code in my functions.php for locating the script file:

function add_my_script() {
    wp_enqueue_script(
        'custom-script', // name your script so that you can attach other scripts and de-register, etc.
        get_stylesheet_directory_uri() . '/custom_js/jquery_test.js', // this is the location of your script file
        array('jquery','jquery-ui-core') // this array lists the scripts upon which your script depends
        , '', true
    );
}
add_action( 'wp_enqueue_scripts', 'add_my_script' );

Then I have this jQuery script:

jquery( document ).ready(function($) {
    $('img.kad-standard-logo').hide();

});

What is wrong here? Why won’t the effect work on the element I have selected?

FYI I am a big newb!

Thanks in advance,
Emre