You need independent web hosting for your images (lab website, personal website, Amazon S3, imgur...), then you can link to them in the html part of the controller with the usual <img> tag (see the Ibex manual for more information on the different ways to pass html to a controller).
It's hard to know why your experiment page doesn't work without more information. In Firefox you can use the console (Tools > Web developer > Web developer tool) to get more informative error messages. Most of the time it's a syntax error in your data file. If you can't find the reason, feel free to share a link to your experiment and the data file.