tzmartin

Instead of renaming $ to jQuery, you can use this wrapper:

(function($){
    // Insert code...

})(jQuery);

Take a look at Fluency Admin 2.0
https://deanjrobinson.com/projects/fluency-admin/

Download link…
https://deanjrobinson.com/download/wp-fluency-2.zip

I believe WP 2.0+ has a javascript function called Toggle. I’ve been using it to quickly hide and show divs while I develop a few plugins.

onclick="toggle('msg1');"