// detect whether __proto__ is supported in this browser
var __proto_supported__ = false;
try
{
	__proto_supported__ = ({}).__proto__;
} catch (e) { /* failed, so stays false */ }

if (typeof Object.create !== 'function')
{
	Object.create = function (o)
	{
		// this could be further modified to support ECMAScript 5 strict mode:
		function F() { if (!__proto_supported__) { this.__proto__ = arguments.callee.prototype; } }
		F.prototype = o;
		return new F();
	};
}

if (typeof Object.prototype.hasancestor !== 'function')
{
	Object.prototype.hasancestor = function(o)
	{
		if (this === o) { return true; }
		else if (!this.__proto__ || !o) { return false; }
		return this.__proto__.hasancestor(o);
	};
}

// quick test
var test_ancestors = function()
{
	var x = {'a':'b'}
	var y = Object.create(x)
	if (!y.hasancestor(x)) { alert('failed'); }
	if (!y.hasancestor(y)) { alert('failed'); }
	if (y.hasancestor(new Object())) { alert('failed'); }
	var z = {'a':'b'}
	if (y.hasancestor(z)) { alert('failed'); }
	if (z.hasancestor(y)) { alert('failed'); }
};