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You are calling jQuery wrong by the shorthand $. If you will look in your console you will see an error that $ is not a function / undeclared etc (this is due to jQuery’s conflict mode if I am not wrong).

Your code should look something like this:

<script type="text/javascript">
jQuery(function($) {
    $( "a.toggle").click(function() {
        $("#log_forms").toggleClass( "open" );
    });
});
</script>