return new Class(proto); 
	extend: function(properties){		var proto = new this($empty);		for (var property in properties){			var pp = proto[property];			proto[property] = Abstract.merge(pp, properties[property]);		}		return new Class(proto);	},
5733	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5733/4e818f6577ad59f62d540b492c6df82cac3c8515/Class.js/clean/Class/Class.js