(function($){
	
	$.randomImage = {
		defaults: {
			
			path: 'images/random_headers/', 
			myImages: ['1.jpg', '2.png', '3.png', '4.png', '5.png' ] 
		}			
	}
	
	$.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);