Responsive Images in Storyline HTML5-Output

Hello! 

We are just about to build a storyline course for 4k tablets. This course should also be available on other devices. Since the loading time should not last forever, we'd like to replace the images if necessary. We have already found some solutions to do this.

e.g.:

• http://adaptive-images.com/
• http://www.smashingmagazine.com/2014/05/12/picturefill-2-0-responsive-images-and-the-perfect-polyfill/

The thing we are missing is the location of the image in the storyline output, since it is minified.

Could anyone point us in the right direction on how to implement a responsive image solution with storyline?

Thank you!

Barbara