function BaseClass() {
	this.container = null;
	
	this.onLoading = function() { 
		this.render();
	}

	this.onFailed = function() {
		this.render();
	}

	this.render = function() {
		this.container.innerHTML = "Test";
	}
}

// --------------------------------------------------------------------------

WeatherClass.prototype = new BaseClass();

function WeatherClass(container) {

	this.container = container;
	
	this.load = function() { 
		WebService.GetWeather(this.onSuccess, this.onFailed); 
	}

	this.onSuccess = function(data) {
		this.render(); /////// Здесь падает: this.render is not a function
	}
}