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There is a newer version: 3.0.0

Jsonix.Class = function() {
	var Class = function() {
		this.initialize.apply(this, arguments);
	};
	var extended = {};
	var empty = function() {
	};
	var parent, initialize, Type;
	for (var i = 0, len = arguments.length; i < len; ++i) {
		Type = arguments[i];
		if (typeof Type == "function") {
			// make the class passed as the first argument the superclass
			if (i === 0 && len > 1) {
				initialize = Type.prototype.initialize;
				// replace the initialize method with an empty function,
				// because we do not want to create a real instance here
				Type.prototype.initialize = empty;
				// the line below makes sure that the new class has a
				// superclass
				extended = new Type();
				// restore the original initialize method
				if (initialize === undefined) {
					delete Type.prototype.initialize;
				} else {
					Type.prototype.initialize = initialize;
				}
			}
			// get the prototype of the superclass
			parent = Type.prototype;
		} else {
			// in this case we're extending with the prototype
			parent = Type;
		}
		Jsonix.Util.extend(extended, parent);
	}
	Class.prototype = extended;
	return Class;
};