I need help with my code for product page

I need help with my code for product page

I thought I was done with the one I used in this web, but it seems to me too sloppy now: 
  1. $(document).ready(function(){ $("#im2, #im3").css("display", "none"); $("#alterna1").click(function(event){ event.preventDefault(); $("#im2, #im3").stop(true, true); $("#im2").fadeOut(100, function(){ $("#im3").fadeOut(100, function(){ $("#im1").fadeIn(100); }); }); }); $("#alterna2").click(function(event){ event.preventDefault(); $("#im1, #im3").stop(true, true); $("#im1").fadeOut(100, function(){ $("#im3").fadeOut(100, function(){ $("#im2").fadeIn(100); }); }); }); $("#alterna3").click(function(event){ event.preventDefault(); $("#im1, #im2").stop(true, true); $("#im1").fadeOut(100, function(){ $("#im2").fadeOut(100, function(){ $("#im3").fadeIn(100); }); }); }); });

I need the big picture to alternate clicking on the thumbnails. Thanks in advance!