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var updateObject = function(sourceObject, targetObject) {
	for (var key in sourceObject) {
		if (sourceObject.hasOwnProperty(key)) { //  skip prototype properties
			if (typeof key === 'object' && targetObject.hasOwnProperty(key)) {  //  if property is an object itself AND target already has such property
				updateObject(sourceObject[key], targetObject[key]); //  run recursively on property
			} else {
				targetObject[key] = sourceObject[key];  //  otherwise it's safe simply to copy property
			}
		}
	}
};