Does not work when WP is in own directory

Hi there,
It is impossible to get the plugin to work on a site where WordPress is it own directory. Like domain.xx/cms/
When I added cms/ in front of the path (cms/wp-content/uploads/randoms) in the code it was added twice:
cms/cms/wp-content/uploads/randoms/ventoux-rose.jpg so no image could be shown. (just displayed the text ‘random image’)
Without the cms/ nothing would show at all.