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It would look something like this:

    (function($) {
        Drupal.behaviors.my_node_toggle = {
          attach: function(context, settings) {
            $(".toggler", context).click(function(){
              $(this).next().slideToggle("slow");
              return false;
            }).next().hide();
          });
          }
        };
    })(jQuery);

That said, I believe your javascript could be put in an external file and added using a preprocess funciton to keep the template free of non-markup! :) Sorry, don't mean to be annoying or a stickler! :)