rem: return this.element.visible(); 
add: return this.visible; 
context: 	isVisible: function() {	  return this.element.visible();	},
meta: 2938	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/2938/37f969c8a2514ac1a945d3e03299fb5ac19ed578/window.js/clean/virtuemart/js/windows/window.js