Double click on plus sign causes first text item selection.

Please see attached screenshot as description of problem.

The bug fix may be the following:

// $Id: jquerymenu_no_animation.js,v 1.4 2010/05/05 07:50:55 aaronhawkins Exp $
Drupal.behaviors.jquerymenu = function(context) {
  $('ul.jquerymenu:not(.jquerymenu-processed)', context).addClass('jquerymenu-processed').each(function(){
    var expandPlus = $(this).find('li.parent span.parent');
    if($.browser.mozilla){//Firefox
      expandPlus.css('MozUserSelect','none');
    }else if($.browser.msie){//IE
      expandPlus.bind('selectstart',function(){return false;});
    }else{//Opera, etc.
      expandPlus.mousedown(function(){return false;});
    }
    expandPlus.click(function(){
      momma = $(this).parent();
      if ($(momma).hasClass('closed')){
        $(momma).removeClass('closed').addClass('open');
        $(this).removeClass('closed').addClass('open');
      }
      else{
        $(momma).removeClass('open').addClass('closed');
        $(this).removeClass('open').addClass('closed');
      }
    });
    showit = function() {
      $(this).children().show();
    }
    hideit = function() {
      $(this).children().hide();
    }
    $(this).find(".editbox").hover(showit, hideit);
  });
}