Changed how foreground image is created to prevent "a.indexOf" is not…

[thiervoj]

When I tried to add an image in foreground a got an "Uncaught TypeError: a.indexOf is not a function" error.

I found that it was coming from the lines that create the image, especially the .load function. So I just switched from jQuery to vanilla js and it works.

EDIT I found that the problem came from jQuery's .load() function, we now have to call the .on('load') function and it works. I found it here : http://stackoverflow.com/a/37915907/5313100

So instead of switching from jQuery to vanilla in my commit, I could just have changed from the load function to the on function, the result would be the same 😄

[Xusifob]

This solved bug for me too

[simontraberg]

Worked for me as well.