(function($){ $.randomImage = { defaults: { //you can change these defaults to your own preferences. path: '', //change this to the path of your images myImages: ['slide_ChooseMORE.jpg', 'slide_EnjoyMORE.jpg', 'slide_FindMORE.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);