[Kαѕρer]

As the title says, why the source of the image doesn't change?

https://pastebin.com/bbivmYu0

[Disease]

As the title says, why the source of the image doesn't change?

https://pastebin.com/bbivmYu0

You're never passing a parameter to your show_kader() function. As such, it has nothing to perform the conditional on. It looks like you've set up show_kleurKader() and show_kleurStuur() to return selected values. You probably meant to pass one of those functions in as the parameter for show_kader().