suppressing browser tooltips, usage example: http://jsbin.com/eliro3/11

jquery.suppressTooltips.js

(function($){
    $.fn.suppressTooltips = function() {
      return this.each(function() {
        var elem = $(this);
        var title = elem.attr('title');
        var alt = elem.attr('alt');
        
        elem.hover(function() {
          elem.attr('title', '').removeAttr('alt');
        }, function() {
          elem.attr({ title: title, alt: alt });
        });
      });
    };
})(jQuery);