function setTitle(titleOptions, subtitleOptions) {

		chartTitleOptions = merge(options.title, titleOptions);
		chartSubtitleOptions = merge(options.subtitle, subtitleOptions);

		// add title and subtitle
		each([
			['title', titleOptions, chartTitleOptions],
			['subtitle', subtitleOptions, chartSubtitleOptions]
		], function (arr) {
			var name = arr[0],
				title = chart[name],
				titleOptions = arr[1],
				chartTitleOptions = arr[2];

			if (title && titleOptions) {
				title = title.destroy(); // remove old
			}
			if (chartTitleOptions && chartTitleOptions.text && !title) {
				chart[name] = renderer.text(
					chartTitleOptions.text,
					0,
					0,
					chartTitleOptions.useHTML
				)
				.attr({
					align: chartTitleOptions.align,
					'class': PREFIX + name,
					zIndex: chartTitleOptions.zIndex || 4
				})
				.css(chartTitleOptions.style)
				.add()
				.align(chartTitleOptions, false, spacingBox);
			}
		});

	}
Show the title and subtitle of the chart

@param titleOptions {Object} New title options
@param subtitleOptions {Object} New subtitle options