Solved! Go to Solution.
Can you post some code that shows the problem?
Have you copied the images to your local computer? The sample is looking for the images in a folder in your applications main directory called images.
If you have copied the images locally you can use Firebug or Chrome Developer tools to try and debug the issue. Firebug and Chrome Dev Tools both allow you to inspect the application while its running and view things like the code and css. You could run the app then use the debugging tools to select the toolbar icon and examine the css for the various icons to see if the images are successfully located.