function hideSlide( slide ) {

		// Hide the slide element
		slide.style.display = 'none';

		// Hide the corresponding background element
		var indices = getIndices( slide );
		var background = getSlideBackground( indices.h, indices.v );
		if( background ) {
			background.style.display = 'none';
		}

	}
Called when the given slide is moved outside of the
configured view distance.