var rotation_delay = 5; // seconds
var dynamic_images = Array('/images/backgrounds/basketball.jpg','/images/backgrounds/joggers.jpg','/images/backgrounds/mvac-basketball.jpg','/images/backgrounds/mvac-bikes.jpg','/images/backgrounds/mvac-ellipticals.jpg','/images/backgrounds/mvac-front.jpg','/images/backgrounds/mvacgroup-a.jpg','/images/backgrounds/mvacgroup-b.jpg','/images/backgrounds/mvacgroup-c.jpg','/images/backgrounds/mvacgroup-d.jpg','/images/backgrounds/mvac-pool.jpg','/images/backgrounds/mvac-spin.jpg','/images/backgrounds/mvac-trainer.jpg','/images/backgrounds/mvac-treadmills.jpg','/images/backgrounds/mvac-weight-machines.jpg','/images/backgrounds/mvac-weights.jpg','/images/backgrounds/mvac-weights-b.jpg','/images/backgrounds/mvac-weights-a.jpg','/images/backgrounds/trainer.jpg');

$(document).ready(function() {
	/* Figure out the current background image of the #inner_content and
	 * modify the DOM to:
	 * 	- remove the background
	 *  - add the image back in as a separate element, before the elements contents
	 * Note that we use the CSS present in dynamic-index.css to make everything
	 * continue to line up correctly.  Why go to all this trouble?
	 *  - this is a bolt-on hack to a single page of a completed design
	 *  - we don't need to come up with and maintain a secondary template
	 *  - regresses nicely
	 */
	var img = $("#inner_content").css('background-image');
	img = img.match( /http:\/\/[a-zA-Z\-\.\/]*/ );
	$("#inner_content").css('background', 'none');
	$("#inner_content").prepend('<div class="background_img_wrapper"><img src="' + img + '" class="background_img"></div>');

	setTimeout('fadeImgOut()', rotation_delay * 1000);
});

function fadeImgOut()
{
    var rand_img = Math.floor(Math.random() * dynamic_images.length);
    
	var img = new Image;
	img.src = dynamic_images[rand_img];
	
	$(".background_img").fadeOut("slow", function() {
		$(".background_img").attr('src', dynamic_images[rand_img]);
		$(".background_img").fadeIn("slow");
		setTimeout('fadeImgOut()', rotation_delay * 1000);
	});
}