[ronie]

Ok, by that, I guess I am doing something wrong

hehe, i prefer to provide (subtle) hints instead of spoon-feeding the entire code ;-)
the 'teach a man to fish' approach...

now, there's two type's of image controls in kodi:
- there's <control type="image"> which is used the display a single image, and needs a <texture> tag to provide the path to the image.
- and there's <control type="multiimage"> which is used to display a folder of images (it creates kind of a slideshow) and needs a <imagepath> tag to provide the path to the image folder.

you can use the first one, both for the genre icon and the trailer image.

Anyhow, I use it do display the image, if a trailer for the highlighted movie has a trailer available to watch. It works perfectly, as you can see in this screen capture:

you know, i actually like that a lot :-)