// Create an array of images that you'd like to use
        var images = [
		            "img/bg_010.jpg",
					"img/bg_011.jpg",
					"img/bg_012.jpg",
        ];
        // The index variable will keep track of which image is currently showing
        var index = 0;
        
        // Call backstretch for the first time,
        // In this case, I'm settings speed of 500ms for a fadeIn effect between images.
        $.backstretch(images[index], {speed: 500});
        
        // Set an interval that increments the index and sets the new image
        // Note: The fadeIn speed set above will be inherited
        setInterval(function() {
            index = (index >= images.length - 1) ? 0 : index + 1;
            $.backstretch(images[index]);
        }, 9000);