docs: function show(content, event){
        switch(arguments.length){
          case 1:
            // if there is only one argument, assume that it is event
            // just update the position and do not update content
            dom.style.display = 'block';
            updatePosition(arguments[0]);
            break;
          case 2:
            if(content){
              $tooltip.html(content);
            }
            dom.style.display = 'block';
            updatePosition(event);
            break;
        }
      }