private void helpAction()
	{
		// Turn the help page.
		if (clickPos.x >= PREVHELP_X && clickPos.x < PREVHELP_X + PREVHELP_W
				&& clickPos.y >= PREVHELP_Y
				&& clickPos.y < PREVHELP_Y + PREVHELP_H) {
			pageNumber = (helpSlides.length + pageNumber - 1)
					% helpSlides.length;
		} else if (clickPos.x >= NEXTHELP_X
				&& clickPos.x < NEXTHELP_X + NEXTHELP_W
				&& clickPos.y >= NEXTHELP_Y
				&& clickPos.y < NEXTHELP_Y + NEXTHELP_H) {
			pageNumber = (pageNumber + 1) % helpSlides.length;
		}
	}