checkTimezoneParameterType = function (sTimezone) {
		if (typeof sTimezone !== "string" && !(sTimezone instanceof String) && sTimezone != null) {
			throw new TypeError("The given timezone must be a string.");
		}
	}
Timezone parameter type check

@param {string} sTimezone The timezone to check
@throws {TypeError} Thrown if the parameter <code>sTimezone</code> is provided and has the wrong type.