(function($){
	$.randomImage = {
		defaults: {			
			//you can change these defaults to your own preferences.
			path: '../images/banners/', //change this to the path of your images
			myImages: ['img1.jpg', 'img2.jpg', 'img3.jpg', 'img4.jpg', 'img5.jpg', 'img6.jpg', 'img7.jpg', 'img8.jpg', 'img9.jpg' ]
		}			
	}	
	$.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);