(function($){
	
	$.randomImage = {
		defaults: {
			//you can change these defaults to your own preferences.
			path: 'images/', //change this to the path of your images
			myImages: ['bkg-page-1.jpg', 'bkg-page-2.jpg' ] //put image names in this bracket. ex: 'harold.jpg', 'maude.jpg', 'etc'			
		}			
	}
	
	$.fn.extend({
		randomImage:function(config) {
			var config = $.extend({}, $.randomImage.defaults, config); 
			 return this.each(function() {
					
				var imageNames = config.myImages;

				//get size of array, randomize a number from this
				// use this number as the array index
				var imageNamesSize = imageNames.length;
				var lotteryNumber = Math.floor(Math.random()*imageNamesSize);
				var winnerImage = imageNames[lotteryNumber];
				var fullPath = config.path + winnerImage;
				
				//put this image into DOM at class of randomImage
				// alt tag will be image filename.
				$(this).attr( {
					src: fullPath,
					alt: winnerImage
				});
			});	
		}
	});
	
})(jQuery);