rem: if(element.style && Element.getStyle(element, 'display') == 'none') 
add: if(element.style && (Element.getStyle(element, 'display') == 'none' || Element.getStyle(element, 'visibility') == 'hidden')) 
context:   _isVisible: function(element) {    element = $(element);    if(!element.parentNode) return true;    this.assertNotNull(element);    if(element.style && Element.getStyle(element, 'display') == 'none')      return false;        return this._isVisible(element.parentNode);  },
meta: 2672	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/2672/8b0f7167a08016f3623c1379a58f8f7439cfc1a9/unittest.js/clean/lib/unittest.js